Active NPI 1821083999 Individual Practitioner Male Practitioner

Dr. Warren Lewis Fields , MD

Internal Medicine • Mystic, CT

✓ Accepts Medicare Assignment Telehealth Available

Professional Overview & Biography Verified Profile Summary

Dr. Warren Fields, MD is a certified Internal Medicine practicing in Mystic, CT. With approximately 35 years of clinical experience since graduating from University Of Connecticut School Of Medicine in 1991, Dr. Fields delivers high-quality medical care to the local community at 200 SANDY HOLLOW RD.

Dr. Fields maintains professional affiliations with Hartford Healthcare Medical Group Inc, Hospital Medicine Associates Llc and accepts Medicare assignment . Telehealth and virtual consultation options are available for eligible patients.

Frequently performed procedures and clinical services include subsequent hospital care with moderate levelof medical decision making, if using time, at least, established patient outpatient office visit, 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

200 Sandy Hollow Rd

Mystic, CT 063551720

Telephone 8605728911

Fax 8605727758

Associated Practice Facility / Clinic

🏢 Mystic Medical Group, Pc Facility NPI 1902891070

Medicare Profile & Education

Medical School

University Of Connecticut School Of Medicine

Graduation Year

1991

Medicare Assignment

✓ Accepts Assignment

Telehealth Flag

Telehealth Services Available

Specialty Benchmarks & Practice Insights

Comparative analytics for Internal Medicine in Mystic, CT

Senior Veteran Specialist (>20 Yrs)

Practitioner Clinical Experience

35 Yrs -2.2 yrs vs City Avg

City Avg: 37.2 Yrs

State Avg: 30.4 Yrs

Regional Practice Density

10 Specialists

Practicing in Mystic, CT (2753 Statewide)

Telehealth Adoption Rate

40.0% Regional Adoption

✓ Offers Virtual Consultations

Medicare Pricing Discount

56.4% Avg Savings

Under CMS Medicare Fee Schedule vs Standard Submitted Charges

Clinical Seniority & Experience Comparison

Dr. Fields (35 Years) 35 Yrs

Mystic Specialty Average (37.2 Years) 37.2 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
99232 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes	688	291	$279.02	$80.20
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	386	205	$312.25	$138.14
99213 Established patient office or other outpatient visit, typically 15 minutes	203	136	$222.76	$98.88
G0439 Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit	133	133	$462.67	$141.04
83036 Hemoglobin A1C level	89	57	$41.07	$9.52
99239 Hospital discharge day management, more than 30 minutes	84	83	$413.50	$116.87
G0008 Administration of influenza virus vaccine	80	80	$65.00	$33.05
90480 Admn sarscov2 vacc 1 dose	71	68	$70.00	$44.56
91320 Sarscv2 vac 30mcg trs-suc im	71	68	$150.00	$140.23
90662 Influenza vaccine split virus, preservative free	68	68	$110.00	$80.33
99233 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes	37	28	$398.54	$120.14
93000 Routine ekg using at least 12 leads including interpretation and report	29	28	$77.07	$15.57
99495 Transitional care management services for problem of at least moderate complexity	22	21	$496.14	$225.59
81002 Urinalysis, manual test	20	18	$15.75	$3.41
G0179 Physician re-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 to affirm the initial imp	18	14	$152.22	$46.04
90677 Pneumococcal conjugate vaccine, 20 valent (pcv20), for intramuscular use	14	14	$375.00	$288.80
G0009 Administration of pneumococcal vaccine	14	14	$70.00	$33.90
90656 Vaccine for influenza for administration into muscle, 0.5 ml dosage	12	12	$40.00	$20.07

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99232 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes	610	264	$265.81	$81.93
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	389	219	$306.20	$134.88
99213 Established patient office or other outpatient visit, typically 15 minutes	208	119	$216.23	$95.34
G0439 Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit	149	149	$451.38	$138.73
99239 Hospital discharge day management, more than 30 minutes	90	90	$391.22	$119.27
G0008 Administration of influenza virus vaccine	89	88	$65.00	$31.77
90662 Influenza vaccine split virus, preservative free	80	79	$73.50	$69.64
99233 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes	78	59	$380.22	$123.38
83036 Hemoglobin A1C level	77	48	$36.30	$9.52
90677 Pneumococcal conjugate vaccine, 20 valent (pcv20), for intramuscular use	65	65	$372.65	$272.70
G0009 Administration of pneumococcal vaccine	62	62	$70.00	$31.98
90480 Admn sarscov2 vacc 1 dose	44	44	$70.00	$42.35
91320 Sarscv2 vac 30mcg trs-suc im	44	44	$150.00	$125.56
0124A Fee covid-19 vac 13 res	27	27	$70.00	$41.73
91312 Coronavirus vaccine 13	27	27	$0.01	$0.01
99223 Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes	20	20	$736.00	$179.83
93000 Routine ekg using at least 12 leads including interpretation and report	18	16	$71.39	$15.63
99495 Transitional care management services for problem of at least moderate complexity	16	14	$485.63	$214.98
81002 Urinalysis, manual test	16	14	$21.88	$3.41

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99232 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes	744	306	$252.51	$73.97
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	302	156	$307.20	$137.67
99213 Established patient office or other outpatient visit, typically 15 minutes	268	154	$212.65	$96.58
99233 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes	163	103	$361.44	$106.38
G0439 Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit	117	117	$459.91	$142.65
G0008 Administration of influenza virus vaccine	104	102	$65.00	$32.00
99239 Hospital discharge day management, more than 30 minutes	102	98	$372.56	$110.20
90662 Influenza vaccine split virus, preservative free	100	98	$70.00	$67.72
0124A Fee covid-19 vac 13 res	91	91	$70.00	$41.82
91312 Coronavirus vaccine 13	91	91	$0.01	$0.01
0054A Intramuscular administration of single severe acute respiratory syndrome coronavirus 2 (covid-19) vaccine, mrna-lnp, spike protein, preservative free, 30 mcg/0.3ml dosage, tris-sucrose formulation; booster dose	82	82	$70.00	$42.71
91305 Sarscov2 vac 30 mcg trs-sucr	82	82	$0.01	$0.01
83036 Hemoglobin A1C level	73	44	$35.00	$9.59
G0009 Administration of pneumococcal vaccine	37	37	$70.00	$32.20
93000 Routine ekg using at least 12 leads including interpretation and report	24	22	$70.00	$15.64
91306 Sarscov2 vac 50mcg/0.25ml im	22	22	$0.01	$0.01
0064A Adm sarscov2 50mcg/0.25mlbst	22	22	$70.00	$38.91
81003 Automated urinalysis test	20	16	$10.00	$2.21
90677 Pneumococcal conjugate vaccine, 20 valent (pcv20), for intramuscular use	19	19	$372.00	$279.09
90732 Vaccine for pneumococcal polysaccharide for injection beneath the skin or into muscle, patient 2 years or older	17	17	$160.00	$132.14
99495 Transitional care management services for problem of at least moderate complexity	15	15	$481.00	$224.68
99217 Hospital observation care on day of discharge	13	13	$254.00	$75.18

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99232 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes	725	302	$228.60	$75.71
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	287	150	$310.00	$140.64
99213 Established patient office or other outpatient visit, typically 15 minutes	267	157	$210.00	$99.51
0003A Adm sarscov2 30mcg/0.3ml 3rd	121	121	$70.00	$43.50
99233 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes	109	73	$326.42	$108.81
83036 Hemoglobin A1C level	105	61	$35.00	$9.53
99239 Hospital discharge day management, more than 30 minutes	98	97	$337.78	$112.63
G0008 Administration of influenza virus vaccine	92	92	$65.00	$18.53
90662 Influenza vaccine split virus, preservative free	89	89	$70.00	$65.26
G0439 Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit	84	84	$470.00	$145.21
0001A Intramuscular administration of single severe acute respiratory syndrome coronavirus 2 (covid-19) vaccine, mrna-lnp, spike protein, preservative free, 30 mcg/0.3ml dosage, diluent reconstituted; first dose	47	47	$30.85	$19.06
93000 Routine ekg using at least 12 leads including interpretation and report	29	28	$70.00	$16.32
0064A Adm sarscov2 50mcg/0.25mlbst	28	28	$70.00	$43.50
0002A Intramuscular administration of single severe acute respiratory syndrome coronavirus 2 (covid-19) vaccine, mrna-lnp, spike protein, preservative free, 30 mcg/0.3ml dosage, diluent reconstituted; second dose	27	27	$50.74	$31.09
0004A Fee covid-19 vac 1 res	23	23	$70.00	$43.50
99495 Transitional care management services for problem of at least moderate complexity	21	21	$475.00	$226.02
G0009 Administration of pneumococcal vaccine	18	18	$70.00	$18.55
81003 Automated urinalysis test	17	16	$10.00	$2.25
99212 Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more	15	12	$130.00	$61.79
82043 Urine microalbumin (protein) level	13	13	$20.00	$5.78
90732 Vaccine for pneumococcal polysaccharide for injection beneath the skin or into muscle, patient 2 years or older	13	13	$160.00	$124.07
91306 Sarscov2 vac 50mcg/0.25ml im	11	11	$0.01	$0.01
99217 Hospital observation care on day of discharge	11	11	$230.00	$76.46

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99232 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes	828	350	$222.00	$77.20
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	301	180	$292.00	$116.52
99213 Established patient office or other outpatient visit, typically 15 minutes	192	120	$197.00	$78.41
99233 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes	142	97	$318.00	$110.61
99239 Hospital discharge day management, more than 30 minutes	133	130	$329.00	$114.86
G0008 Administration of influenza virus vaccine	98	98	$60.00	$18.32
90662 Influenza vaccine split virus, preservative free	96	96	$66.00	$60.98
83036 Hemoglobin A1C level	72	50	$30.00	$9.36
G0439 Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit	39	39	$444.00	$126.09
99225 Subsequent observation care, typically 25 minutes per day	38	23	$224.00	$77.47
99442 Telephone medical discussion with physician, 11-20 minutes	34	31	$83.24	$81.35
99443 Telephone medical discussion with physician, 21-30 minutes	31	25	$117.52	$118.71
G0442 Annual alcohol misuse screening, 5 to 15 minutes	20	20	$56.00	$19.85
G0009 Administration of pneumococcal vaccine	20	20	$65.00	$18.22
99495 Transitional care management services for problem of at least moderate complexity	20	16	$448.00	$200.18
93000 Routine ekg using at least 12 leads including interpretation and report	20	19	$64.00	$18.94
99217 Hospital observation care on day of discharge	17	17	$224.00	$77.84
90732 Vaccine for pneumococcal polysaccharide for injection beneath the skin or into muscle, patient 2 years or older	13	13	$150.00	$119.31
81003 Automated urinalysis test	12	11	$8.00	$2.25

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99232 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes	918	401	$216.58	$76.89
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	434	216	$292.00	$116.08
99213 Established patient office or other outpatient visit, typically 15 minutes	268	177	$197.00	$79.27
99233 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes	172	121	$309.98	$109.83
99239 Hospital discharge day management, more than 30 minutes	161	156	$321.05	$113.61
G0439 Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit	156	156	$444.00	$124.50
G0008 Administration of influenza virus vaccine	104	104	$60.00	$17.96
83036 Hemoglobin A1C level	82	49	$30.00	$10.57
96372 Injection beneath the skin or into muscle for therapy, diagnosis, or prevention	69	11	$84.00	$18.07
90653 Vaccine for influenza for injection into muscle	50	50	$53.00	$51.94
G0009 Administration of pneumococcal vaccine	44	44	$65.00	$17.96
90686 Vaccine for influenza for administration into muscle, 0.5 ml dosage	36	36	$30.00	$18.65
90732 Vaccine for pneumococcal polysaccharide for injection beneath the skin or into muscle, patient 2 years or older	27	27	$150.00	$110.99
99223 Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes	27	27	$612.00	$213.80
81003 Automated urinalysis test	26	22	$8.00	$2.35
99217 Hospital observation care on day of discharge	25	25	$220.04	$77.64
99225 Subsequent observation care, typically 25 minutes per day	25	19	$219.16	$77.28
99204 New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more	23	23	$447.00	$172.05
93000 Routine ekg using at least 12 leads including interpretation and report	20	19	$64.00	$18.48
99495 Transitional care management services for problem of at least moderate complexity	19	16	$448.00	$169.97
90670 Pneumococcal vaccine for injection into muscle	18	18	$292.00	$209.91
90662 Influenza vaccine split virus, preservative free	18	18	$66.00	$54.89
G0444 Annual depression screening, 5 to 15 minutes	12	12	$54.90	$19.50
G0442 Annual alcohol misuse screening, 5 to 15 minutes	12	12	$56.00	$19.50
99203 New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more	11	11	$295.00	$117.46

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99232 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes	662	347	$196.38	$77.19
99213 Established patient office or other outpatient visit, typically 15 minutes	488	280	$197.00	$78.42
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	283	141	$292.00	$115.25
99233 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes	250	161	$283.29	$110.46
G0439 Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit	177	177	$444.00	$124.98
99239 Hospital discharge day management, more than 30 minutes	155	154	$291.72	$114.64
G0008 Administration of influenza virus vaccine	85	85	$60.00	$22.26
83036 Hemoglobin A1C level	82	51	$30.00	$11.61
81003 Automated urinalysis test	77	75	$8.00	$2.71
90686 Vaccine for influenza for administration into muscle, 0.5 ml dosage	64	64	$30.00	$18.65
J3420 Injection, vitamin b-12 cyanocobalamin, up to 1000 mcg	62	14	$8.00	$1.95
96372 Injection beneath the skin or into muscle for therapy, diagnosis, or prevention	58	13	$84.00	$22.38
93000 Routine ekg using at least 12 leads including interpretation and report	38	36	$64.00	$18.50
99225 Subsequent observation care, typically 25 minutes per day	38	26	$198.79	$77.55
99223 Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes	32	32	$553.03	$215.13
99217 Hospital observation care on day of discharge	30	30	$198.33	$77.91
81002 Urinalysis, manual test	30	29	$21.00	$3.41
90662 Influenza vaccine split virus, preservative free	25	25	$66.00	$52.30
G0009 Administration of pneumococcal vaccine	24	24	$65.00	$22.26
99495 Transitional care management services for problem of at least moderate complexity	22	20	$448.00	$176.63
G0442 Annual alcohol misuse screening, 5 to 15 minutes	18	18	$56.00	$19.87
G0444 Annual depression screening, 5 to 15 minutes	16	16	$54.90	$19.48
90670 Pneumococcal vaccine for injection into muscle	15	15	$292.00	$200.20
G0402 Initial preventive physical examination; face-to-face visit, services limited to new beneficiary during the first 12 months of medicare enrollment	13	13	$633.00	$178.12
99204 New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more	12	12	$447.00	$176.69

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99232 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes	828	415	$186.06	$74.70
99213 Established patient office or other outpatient visit, typically 15 minutes	631	298	$121.31	$78.04
99233 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes	303	194	$268.61	$108.31
G0439 Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit	194	194	$223.90	$124.34
99239 Hospital discharge day management, more than 30 minutes	181	180	$276.42	$111.84
G0442 Annual alcohol misuse screening, 5 to 15 minutes	179	179	$30.00	$19.48
G0444 Annual depression screening, 5 to 15 minutes	175	175	$40.00	$19.48
G0008 Administration of influenza virus vaccine	140	140	$34.07	$27.77
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	124	80	$165.74	$115.16
90662 Influenza vaccine split virus, preservative free	118	118	$50.00	$47.89
81002 Urinalysis, manual test	102	99	$8.64	$3.43
99212 Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more	87	45	$71.15	$46.40
99223 Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes	53	53	$520.81	$211.10
83036 Hemoglobin A1C level	46	32	$18.59	$13.05
J3420 Injection, vitamin b-12 cyanocobalamin, up to 1000 mcg	46	11	$4.52	$3.00
G0328 Colorectal cancer screening; fecal occult blood test, immunoassay, 1-3 simultaneous	44	44	$12.00	$11.76
99222 Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes	43	42	$354.70	$142.73
93000 Routine ekg using at least 12 leads including interpretation and report	40	39	$56.58	$18.48
99217 Hospital observation care on day of discharge	28	28	$188.82	$76.18
99225 Subsequent observation care, typically 25 minutes per day	21	18	$187.43	$75.82
90686 Vaccine for influenza for administration into muscle, 0.5 ml dosage	16	16	$30.00	$18.65
G0009 Administration of pneumococcal vaccine	15	15	$30.00	$27.77
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	11	$120.00	$58.03
90670 Pneumococcal vaccine for injection into muscle	11	11	$200.00	$181.57

Medical Specialties & State Licenses

Internal Medicine Primary Specialty

NUCC Taxonomy Code: 207R00000X

State License CT 035098

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.

Hospital & Practice Group Affiliations

Hartford Healthcare Medical Group Inc

55 Meriden Ave, Southington, CT 064893239

Phone: 8602765144

Hospital Medicine Associates Llc

365 Montauk Ave, New London, CT 063204700

Phone: 8604420711

Practice Associates & Co-Workers

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

8 Associated Practitioners

Dr. Thomas Blum , MD

Internal Medicine

NPI 1194710210

Doctor of Medicine (M.D.)

Dr. James Scarles , MD

Internal Medicine

NPI 1194710269

Doctor of Medicine (M.D.)

Dr. Howard Brensilver , MD

Internal Medicine

NPI 1336134451

Doctor of Medicine (M.D.)

Dr. Rosemary Bontempi , MD

Internal Medicine

NPI 1346235462

Doctor of Medicine (M.D.)

Shaniya Rosenkrantz , APRN

Nurse Practitioner - Family

NPI 1497415699

Advanced Practice Registered Nurse

Dr. Etny Candelario , MD

Family Medicine

NPI 1568084150

Doctor of Medicine (M.D.)

Career & Practice History Timeline

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

6 Historical Events

✅

NPI Profile Active December 22, 2009

NPI status registered as active in NPPES database

📍

Updated Practice Location December 22, 2009

Registered at 200 SANDY HOLLOW RD, MYSTIC, CT 063551720 (Tel: 8605728911)

📍

Updated Business Mailing Address December 22, 2009

Registered at 200 SANDY HOLLOW RD, MYSTIC, CT 063551720 (Tel: 8605728911)

👤

Provider Name / Credentials Updated December 22, 2009

Recorded as WARREN FIELDS, M.D.

🎓

Medical Taxonomy / Specialty Registered (Primary Specialty) December 22, 2009

Internal Medicine (License #035098 in CT)

🟢

Initial NPI Registration & Enumeration September 15, 2005

First registered as active Individual Practitioner in NPPES Database.

Patient & Community Reviews

Verified patient ratings, medical care experiences, and facility photos

0 Reviews

No patient reviews submitted yet for Dr. Warren Fields. Be the first to share your experience!

Only verified registered users can submit ratings, post feedback, and upload facility photos.

NPI Administrative Meta

NPI Number: 1821083999

Entity Type:

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

Enumeration Date: September 15, 2005

Last Update: December 22, 2009

Sole Proprietor: No

Update or Correct Profile

Mailing Address

200 Sandy Hollow Rd

Mystic, CT 063551720

Phone: 8605728911

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.