Active NPI 1629043625 Individual Practitioner Male Practitioner

Dr. Peter John Drennan , DO

Internal Medicine • Enfield, CT

✓ Accepts Medicare Assignment Telehealth Available

Professional Overview & Biography Verified Profile Summary

Dr. Peter Drennan, DO is a certified Internal Medicine practicing in Enfield, CT. With approximately 43 years of clinical experience since graduating from University Of New England, College Of Osteo Medicine in 1983, Dr. Drennan delivers high-quality medical care to the local community at 701 ENFIELD ST.

Dr. Drennan maintains professional affiliations with Springfield Medical Associates, Inc., Baystate Medical Practices Inc and accepts Medicare assignment . Telehealth and virtual consultation options are available for eligible patients.

Frequently performed procedures and clinical services include established patient outpatient office visit, visit complexity inherent to evaluation and management associated with medical care services that serve as the continuing focal point for all needed health care services and/or with medical care services that are part of ongoing care related to a patient's, annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit. Full Medicare procedure pricing transparency rates and service volume details are listed on this profile.

Practice Location & Contact Primary Location

Practice Address

701 Enfield St

Enfield, CT 060822961

Telephone 8607416058

Fax 4137335860

Associated Practice Facility / Clinic

🏢 Rosemarie Thompson, Rd Facility NPI 1326144973

Medicare Profile & Education

Medical School

University Of New England, College Of Osteo Medicine

Graduation Year

1983

Medicare Assignment

✓ Accepts Assignment

Telehealth Flag

Telehealth Services Available

Specialty Benchmarks & Practice Insights

Comparative analytics for Internal Medicine in Enfield, CT

Senior Veteran Specialist (>20 Yrs)

Practitioner Clinical Experience

43 Yrs +11.4 yrs vs City Avg

City Avg: 31.6 Yrs

State Avg: 30.4 Yrs

Regional Practice Density

20 Specialists

Practicing in Enfield, CT (2753 Statewide)

Telehealth Adoption Rate

60.0% Regional Adoption

✓ Offers Virtual Consultations

Medicare Pricing Discount

51.0% Avg Savings

Under CMS Medicare Fee Schedule vs Standard Submitted Charges

Clinical Seniority & Experience Comparison

Dr. Drennan (43 Years) 43 Yrs

Enfield Specialty Average (31.6 Years) 31.6 Yrs

Performed Procedures & Service Volume

Top Medicare Part B procedures performed by this practitioner

CMS Official Data (2024)

Reporting Year:

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	405	193	$320.77	$132.85
99213 Established patient office or other outpatient visit, typically 15 minutes	294	173	$235.00	$94.93
G2211 Visit complexity inherent to evaluation and management associated with medical care services that serve as the continuing focal point for all needed health care services and/or with medical care services that are part of ongoing care related to a patient's	208	132	$50.00	$16.84
G0439 Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit	163	163	$175.00	$135.03
93793 Anticoagulant management of patient taking warfarin	109	11	$100.00	$11.76
G0008 Administration of influenza virus vaccine	45	45	$65.00	$33.90
90662 Influenza vaccine split virus, preservative free	41	41	$89.76	$81.74
93000 Routine ekg using at least 12 leads including interpretation and report	30	28	$85.00	$15.07
90677 Pneumococcal conjugate vaccine, 20 valent (pcv20), for intramuscular use	26	26	$475.00	$291.02
G0009 Administration of pneumococcal vaccine	25	25	$55.00	$33.90
99442 Telephone medical discussion with physician, 11-20 minutes	23	21	$180.00	$94.21
99212 Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more	19	15	$130.00	$59.34
G0180 Physician or allowed practitioner certification for medicare-covered home health services under a home health plan of care (patient not present), including contacts with home health agency and review of reports of patient status required by physicians and	17	15	$198.00	$56.10

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	383	192	$292.72	$134.48
99213 Established patient office or other outpatient visit, typically 15 minutes	299	168	$235.00	$94.71
G0439 Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit	149	149	$175.00	$135.82
93793 Anticoagulant management of patient taking warfarin	108	12	$100.00	$12.08
99442 Telephone medical discussion with physician, 11-20 minutes	79	59	$180.00	$95.47
G0008 Administration of influenza virus vaccine	56	53	$65.00	$32.50
90662 Influenza vaccine split virus, preservative free	49	47	$80.00	$71.79
93000 Routine ekg using at least 12 leads including interpretation and report	35	32	$85.00	$15.38
G0009 Administration of pneumococcal vaccine	26	26	$55.00	$32.50
99212 Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more	24	23	$130.00	$58.34
90677 Pneumococcal conjugate vaccine, 20 valent (pcv20), for intramuscular use	23	23	$444.57	$282.05
99443 Telephone medical discussion with physician, 21-30 minutes	19	19	$260.00	$133.85
G0180 Physician or allowed practitioner certification for medicare-covered home health services under a home health plan of care (patient not present), including contacts with home health agency and review of reports of patient status required by physicians and	18	17	$198.00	$55.35

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	425	196	$289.93	$136.51
36415 Insertion of needle into vein for collection of blood sample	353	182	$16.00	$2.96
99213 Established patient office or other outpatient visit, typically 15 minutes	293	173	$219.47	$97.27
85027 Complete blood cell count (red cells, white blood cell, platelets), automated test	144	116	$19.00	$6.35
93793 Anticoagulant management of patient taking warfarin	142	11	$100.00	$12.07
G0439 Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit	128	128	$175.00	$139.90
80053 Blood test, comprehensive group of blood chemicals	109	93	$31.00	$10.34
80061 Blood test, lipids (cholesterol and triglycerides)	103	89	$50.00	$13.24
83036 Hemoglobin A1C level	100	68	$29.00	$9.49
99442 Telephone medical discussion with physician, 11-20 minutes	85	72	$180.00	$97.14
80048 Blood test, basic group of blood chemicals (calcium, total)	76	55	$25.00	$8.36
84443 Blood test, thyroid stimulating hormone (TSH)	63	53	$49.00	$16.59
93000 Routine ekg using at least 12 leads including interpretation and report	51	48	$85.00	$15.45
G0008 Administration of influenza virus vaccine	44	44	$65.00	$31.98
99212 Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more	36	33	$130.00	$60.58
82607 Cyanocobalamin (vitamin B-12) level	33	25	$44.00	$14.87
85025 Complete blood cell count (red cells, white blood cell, platelets), automated test and automated differential white blood cell count	32	28	$23.00	$7.66
82306 Vitamin d-3 level	32	31	$85.00	$29.20
83721 Ldl cholesterol level	22	21	$28.00	$10.38
90662 Influenza vaccine split virus, preservative free	20	20	$80.00	$68.38
90694 Influenza vaccine, quadrivalent inactivated, 0.5 ml dosage	20	20	$110.00	$70.25
G0103 Prostate cancer screening; prostate specific antigen test (psa)	20	20	$54.00	$19.09
82565 Blood creatinine level	19	18	$15.00	$5.07
82570 Creatinine level to test for kidney function or muscle injury	17	17	$30.00	$5.11
82043 Urine microalbumin (protein) level	17	17	$17.00	$5.70
81001 Manual urinalysis test with examination using microscope, automated	17	14	$21.00	$3.14
99496 Transitional care management services for problem of high complexity	17	13	$550.00	$299.65
80051 Blood test panel for electrolytes (sodium potassium, chloride, carbon dioxide)	17	14	$21.00	$6.95
84439 Thyroxine (thyroid chemical), free	16	14	$27.00	$8.90
99443 Telephone medical discussion with physician, 21-30 minutes	14	14	$260.00	$136.97
G0009 Administration of pneumococcal vaccine	13	13	$55.00	$32.09
99204 New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more	12	12	$400.00	$179.76
84520 Urea nitrogen level to assess kidney function	11	11	$11.00	$3.91

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
36415 Insertion of needle into vein for collection of blood sample	431	221	$16.00	$2.99
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	334	186	$272.22	$139.34
99213 Established patient office or other outpatient visit, typically 15 minutes	329	183	$188.27	$98.38
85027 Complete blood cell count (red cells, white blood cell, platelets), automated test	165	123	$19.00	$6.44
80053 Blood test, comprehensive group of blood chemicals	154	131	$31.00	$10.50
G0439 Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit	114	114	$175.00	$142.90
83036 Hemoglobin A1C level	110	71	$29.00	$9.53
93793 Anticoagulant management of patient taking warfarin	100	22	$100.00	$12.28
99442 Telephone medical discussion with physician, 11-20 minutes	97	77	$180.00	$99.21
80061 Blood test, lipids (cholesterol and triglycerides)	97	89	$50.00	$13.27
85610 Blood test, clotting time	82	11	$11.00	$4.29
84443 Blood test, thyroid stimulating hormone (TSH)	75	61	$49.00	$16.80
80048 Blood test, basic group of blood chemicals (calcium, total)	75	58	$25.00	$8.46
G0008 Administration of influenza virus vaccine	57	57	$65.00	$18.52
85025 Complete blood cell count (red cells, white blood cell, platelets), automated test and automated differential white blood cell count	53	45	$23.00	$7.77
99212 Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more	46	40	$120.87	$61.16
82306 Vitamin d-3 level	46	44	$85.00	$29.07
83721 Ldl cholesterol level	45	43	$28.00	$10.50
93000 Routine ekg using at least 12 leads including interpretation and report	44	39	$85.00	$16.13
82607 Cyanocobalamin (vitamin B-12) level	37	28	$44.00	$15.08
90662 Influenza vaccine split virus, preservative free	35	35	$80.00	$65.26
82570 Creatinine level to test for kidney function or muscle injury	30	27	$30.00	$5.18
82728 Ferritin (blood protein) level	29	18	$40.00	$13.63
82043 Urine microalbumin (protein) level	29	26	$17.00	$5.78
80051 Blood test panel for electrolytes (sodium potassium, chloride, carbon dioxide)	27	21	$21.00	$7.01
82565 Blood creatinine level	25	24	$15.00	$5.12
G0103 Prostate cancer screening; prostate specific antigen test (psa)	24	24	$54.00	$19.31
81001 Manual urinalysis test with examination using microscope, automated	21	15	$21.00	$3.17
84520 Urea nitrogen level to assess kidney function	21	20	$11.00	$3.95
99203 New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more	19	19	$265.00	$121.48
90694 Influenza vaccine, quadrivalent inactivated, 0.5 ml dosage	18	18	$110.00	$66.43
81003 Automated urinalysis test	17	16	$6.00	$2.25
G0009 Administration of pneumococcal vaccine	15	14	$55.00	$18.53
84439 Thyroxine (thyroid chemical), free	15	14	$27.00	$9.02
99443 Telephone medical discussion with physician, 21-30 minutes	15	12	$260.00	$140.44
80076 Liver function blood test panel	14	14	$24.00	$8.17
85651 Red blood cell sedimentation rate, to detect inflammation, non-automated	13	12	$11.00	$4.27
99495 Transitional care management services for problem of at least moderate complexity	13	11	$400.00	$223.13
84153 Psa (prostate specific antigen) measurement, total	12	12	$54.00	$18.39
87635 Amplifed dna or rna probe detection of severe acute respiratory syndrome coronavirus 2 (covid-19) antigen	12	12	$75.00	$51.31

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	226	143	$260.00	$116.88
36415 Insertion of needle into vein for collection of blood sample	179	110	$16.00	$3.00
99213 Established patient office or other outpatient visit, typically 15 minutes	96	72	$180.00	$79.52
85027 Complete blood cell count (red cells, white blood cell, platelets), automated test	85	66	$19.00	$6.46
80053 Blood test, comprehensive group of blood chemicals	66	59	$31.00	$10.54
83036 Hemoglobin A1C level	57	44	$29.00	$9.70
G0439 Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit	51	51	$175.00	$125.89
84443 Blood test, thyroid stimulating hormone (TSH)	44	38	$49.00	$16.78
80061 Blood test, lipids (cholesterol and triglycerides)	39	39	$50.00	$13.39
82306 Vitamin d-3 level	32	29	$85.00	$29.56
80048 Blood test, basic group of blood chemicals (calcium, total)	31	24	$25.00	$8.43
G0008 Administration of influenza virus vaccine	31	30	$65.00	$18.32
99212 Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more	30	23	$110.00	$49.88
90662 Influenza vaccine split virus, preservative free	30	29	$77.33	$58.74
83721 Ldl cholesterol level	30	30	$28.00	$10.49
82607 Cyanocobalamin (vitamin B-12) level	29	18	$44.00	$15.04
99442 Telephone medical discussion with physician, 11-20 minutes	25	19	$180.00	$81.50
82043 Urine microalbumin (protein) level	17	17	$17.00	$5.78
99443 Telephone medical discussion with physician, 21-30 minutes	17	15	$260.00	$116.00
82570 Creatinine level to test for kidney function or muscle injury	17	17	$30.00	$5.18
85025 Complete blood cell count (red cells, white blood cell, platelets), automated test and automated differential white blood cell count	16	15	$23.00	$7.77
93000 Routine ekg using at least 12 leads including interpretation and report	15	15	$85.00	$18.75
99203 New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more	13	13	$265.00	$115.34
G0009 Administration of pneumococcal vaccine	12	12	$55.00	$18.33
82746 Folic acid level	12	12	$43.00	$14.68
G0103 Prostate cancer screening; prostate specific antigen test (psa)	11	11	$54.00	$19.31

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99213 Established patient office or other outpatient visit, typically 15 minutes	189	89	$260.00	$78.38
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	160	84	$390.00	$114.66
36415 Insertion of needle into vein for collection of blood sample	84	57	$20.00	$2.94
G0439 Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit	61	61	$340.00	$122.89
99212 Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more	39	31	$160.00	$47.84
G0008 Administration of influenza virus vaccine	34	32	$80.00	$17.53
93000 Routine ekg using at least 12 leads including interpretation and report	26	23	$70.00	$18.10
99496 Transitional care management services for problem of high complexity	25	19	$600.00	$244.43
G0180 Physician or allowed practitioner certification for medicare-covered home health services under a home health plan of care (patient not present), including contacts with home health agency and review of reports of patient status required by physicians and	23	17	$250.00	$56.28
90662 Influenza vaccine split virus, preservative free	22	22	$100.00	$54.89
G0009 Administration of pneumococcal vaccine	20	19	$80.00	$17.85
90732 Vaccine for pneumococcal polysaccharide for injection beneath the skin or into muscle, patient 2 years or older	13	13	$225.00	$109.98

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	271	128	$390.00	$111.98
36415 Insertion of needle into vein for collection of blood sample	136	85	$20.00	$2.92
99213 Established patient office or other outpatient visit, typically 15 minutes	117	75	$260.00	$75.33
G0439 Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit	46	46	$340.00	$122.09
93000 Routine ekg using at least 12 leads including interpretation and report	43	36	$70.00	$17.57
G0008 Administration of influenza virus vaccine	27	27	$80.00	$23.15
99212 Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more	26	19	$160.00	$46.18
99496 Transitional care management services for problem of high complexity	25	16	$600.00	$243.21
90653 Vaccine for influenza for injection into muscle	23	23	$115.00	$53.39
G0009 Administration of pneumococcal vaccine	22	22	$80.00	$23.21
90732 Vaccine for pneumococcal polysaccharide for injection beneath the skin or into muscle, patient 2 years or older	16	16	$225.00	$105.59
G0180 Physician or allowed practitioner certification for medicare-covered home health services under a home health plan of care (patient not present), including contacts with home health agency and review of reports of patient status required by physicians and	14	12	$250.00	$56.39
99211 Office or other outpatient visit for the evaluation and management of established patient that may not require presence of healthcare professional	13	11	$80.00	$22.86

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	216	154	$329.32	$111.29
99213 Established patient office or other outpatient visit, typically 15 minutes	76	63	$246.32	$75.54
36415 Insertion of needle into vein for collection of blood sample	60	52	$20.00	$2.94
G0439 Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit	53	53	$330.19	$119.76
G0008 Administration of influenza virus vaccine	39	39	$77.44	$28.66
93000 Routine ekg using at least 12 leads including interpretation and report	35	33	$66.74	$17.65
G0009 Administration of pneumococcal vaccine	33	33	$76.36	$28.66
99203 New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more	30	30	$390.00	$111.36
99212 Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more	25	22	$153.88	$45.36
90670 Pneumococcal vaccine for injection into muscle	25	25	$384.80	$186.97
90662 Influenza vaccine split virus, preservative free	22	22	$100.00	$48.05
99495 Transitional care management services for problem of at least moderate complexity	20	17	$412.00	$169.08
G0447 Face-to-face behavioral counseling for obesity, 15 minutes	19	15	$44.00	$26.39
G0438 Annual wellness visit; includes a personalized prevention plan of service (pps), initial visit	16	16	$498.44	$176.33
99204 New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more	15	15	$580.00	$168.57
G0442 Annual alcohol misuse screening, 5 to 15 minutes	11	11	$31.00	$18.76

Medical Specialties & State Licenses

CMS Verified: 2026-05-11

Internal Medicine Primary Specialty

NUCC Taxonomy Code: 207R00000X

State License CT 64560

A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.

Internal Medicine

NUCC Taxonomy Code: 207R00000X

State License MA 54104

Additional State Medicaid & Healthcare Payer Identifiers

Medicaid State Provider ID

110051774A (MA)

Medicaid State Provider ID

003116242 (CT)

Medicaid State Provider ID

64994127 (MA)

Hospital & Practice Group Affiliations

Baystate Medical Practices Inc

701 Enfield St, Enfield, CT 060822961

Phone: 8607416058

Springfield Medical Associates, Inc.

701 Enfield St, Enfield, CT 060822977

Phone: 8607416058

Practice Associates & Co-Workers

Healthcare professionals and specialists practicing at this location or sharing practice phone/fax

21 Associated Practitioners

Tina Tkaczek , NP

Nurse Practitioner

NPI 1154335354

Nurse Practitioner

Kara Sawyer , MSN, NP-C

Nurse Practitioner

NPI 1164873600

Master of Science in Nursing, Nurse Practitioner (Certified)

Julie Wondolowski , PA-C

Physician Assistant - Medical

NPI 1205857000

Physician Assistant (Certified)

Kaitlin Pulito , PA-C

Physician Assistant - Medical

NPI 1215245543

Physician Assistant (Certified)

Cailyn Bolduc , PA-C

Physician Assistant - Medical

NPI 1215748355

Physician Assistant (Certified)

Karen Krustapentus , APRN, BC

Nurse Practitioner

NPI 1285660860

Advanced Practice Registered Nurse, BC

Career & Practice History Timeline

Chronological log of verified NPI updates, location relocations, credentials, and registry changes

12 Historical Events

📍

Updated Practice Location May 11, 2026

Registered at 701 ENFIELD ST, ENFIELD, CT 060822961 (Tel: 8607416058)

📍

Updated Business Mailing Address May 11, 2026

Registered at 280 CHESTNUT ST FL 2, SPRINGFIELD, MA 011991001 (Tel: 4137945700)

🎓

Medical Taxonomy / Specialty Registered (Primary Specialty) May 11, 2026

Internal Medicine (License #64560 in CT)

📍

Updated Practice Location December 30, 2019

Registered at 701 ENFIELD STREET, ENFIELD, CT 06082 (Tel: 8607416058)

📍

Updated Business Mailing Address December 30, 2019

Registered at 2150 MAIN STREET, SPRINGFIELD, MA 01104 (Tel: 4137395676)

👤

Provider Name / Credentials Updated December 30, 2019

Recorded as PETER DRENNAN, D.O.

✅

NPI Profile Active June 03, 2009

NPI status registered as active in NPPES database

📍

Updated Practice Location June 03, 2009

Registered at 900 MEMORIAL AVE, WEST SPRINGFIELD, MA 010893557 (Tel: 4137399001)

📍

Updated Business Mailing Address June 03, 2009

Registered at 354 BIRNIE AVE STE 202, SPRINGFIELD, MA 011071109 (Tel: 4137333470)

👤

Provider Name / Credentials Updated June 03, 2009

Recorded as PETER DRENNAN, DO

🎓

Medical Taxonomy / Specialty Registered (Primary Specialty) June 03, 2009

Internal Medicine (License #54104 in MA)

🟢

Initial NPI Registration & Enumeration February 22, 2006

First registered as active Individual Practitioner in NPPES Database.

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NPI Administrative Meta

NPI Number: 1629043625

Entity Type:

Individual Provider Physician, Nurse Practitioner, or Solo Healthcare Professional (Type 1 NPI)

Enumeration Date: February 22, 2006

Last Update: May 11, 2026

Sole Proprietor: No

Update or Correct Profile

Mailing Address

280 Chestnut St Fl 2

Springfield, MA 011991001

Phone: 4137945700

Public Domain Record This profile contains public domain information published by CMS and NPPES under the Freedom of Information Act (FOIA).

⚠️ Medical Disclaimer

This directory listing is for informational purposes only and does not constitute medical advice, diagnosis, or physician endorsement. If you are experiencing a medical emergency, please call 911 immediately.