Active NPI 1710102124 Individual Practitioner Female Practitioner

Dr. Kathryn Grinnen , DO

Internal Medicine • Lewes, DE

✓ Accepts Medicare Assignment Telehealth Available

Professional Overview & Biography Verified Profile Summary

Dr. Kathryn Grinnen, DO is a certified Internal Medicine practicing in Lewes, DE. With approximately 20 years of clinical experience since graduating from Lake Erie College Of Osteopathic Medicine, Erie in 2006, Dr. Grinnen delivers high-quality medical care to the local community at 16295 WILLOW CREEK RD.

Dr. Grinnen is affiliated with Core Concierge Primary Care And Wellness Llc 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, insertion of needle into vein for collection of blood sample, 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

16295 Willow Creek Rd

Lewes, DE 199583614

Telephone 3026453555

Associated Practice Facility / Clinic

🏢 Clinic By The Sea Llc Facility NPI 1477561306

Medicare Profile & Education

Medical School

Lake Erie College Of Osteopathic Medicine, Erie

Graduation Year

2006

Medicare Assignment

✓ Accepts Assignment

Telehealth Flag

Telehealth Services Available

Specialty Benchmarks & Practice Insights

Comparative analytics for Internal Medicine in Lewes, DE

Senior Veteran Specialist (>20 Yrs)

Practitioner Clinical Experience

20 Yrs -4.0 yrs vs City Avg

City Avg: 24.0 Yrs

State Avg: 25.8 Yrs

Regional Practice Density

44 Specialists

Practicing in Lewes, DE (625 Statewide)

Telehealth Adoption Rate

20.5% Regional Adoption

✓ Offers Virtual Consultations

Medicare Pricing Discount

33.8% Avg Savings

Under CMS Medicare Fee Schedule vs Standard Submitted Charges

Clinical Seniority & Experience Comparison

Dr. Grinnen (20 Years) 20 Yrs

Lewes Specialty Average (24.0 Years) 24.0 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	169	$193.50	$126.72
99213 Established patient office or other outpatient visit, typically 15 minutes	293	138	$136.83	$89.85
36415 Insertion of needle into vein for collection of blood sample	123	79	$4.50	$4.41
G0439 Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit	113	113	$196.14	$128.34
93000 Routine ekg using at least 12 leads including interpretation and report	100	86	$21.95	$14.12
99349 Residence visit for established patient with moderate level of medical decision making, per day, if using time, at least 40 minutes	73	30	$192.38	$124.71
96372 Injection beneath the skin or into muscle for therapy, diagnosis, or prevention	64	20	$32.30	$14.14
G0008 Administration of influenza virus vaccine	61	61	$46.71	$31.89
90653 Vaccine for influenza for injection into muscle	58	58	$125.25	$81.82
99204 New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more	45	45	$252.06	$165.13
99348 Residence visit for established patient with low level of medical decision making, per day, if using time, at least 30 minutes	39	26	$114.89	$74.96
91320 Sarscv2 vac 30mcg trs-suc im	32	32	$233.85	$152.78
90480 Admn sarscov2 vacc 1 dose	32	32	$46.71	$42.52
81003 Automated urinalysis test	21	13	$1.75	$1.71
87428 Detection test by immunoassay technique for severe acute respiratory syndrome coronavirus and influenza	16	14	$25.00	$24.50
99344 New patient home visit, typically 1 hour	15	15	$216.92	$139.14
99442 Telephone medical discussion with physician, 11-20 minutes	12	11	$136.83	$89.68
87426 Detection test by immunoassay technique for severe acute respiratory syndrome coronavirus	11	11	$10.50	$10.29
69210 Removal of impacted ear wax	11	11	$72.41	$47.25

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
J0897 Injection, denosumab, 1 mg	2,160	29	$23.39	$22.56
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	554	361	$218.55	$128.13
G0439 Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit	221	221	$260.52	$130.49
99213 Established patient office or other outpatient visit, typically 15 minutes	220	173	$150.28	$90.98
93000 Routine ekg using at least 12 leads including interpretation and report	105	99	$25.71	$14.60
G0008 Administration of influenza virus vaccine	63	62	$49.79	$30.63
90694 Influenza vaccine, quadrivalent inactivated, 0.5 ml dosage	61	60	$567.23	$74.02
96372 Injection beneath the skin or into muscle for therapy, diagnosis, or prevention	56	36	$30.62	$14.17
0124A Fee covid-19 vac 13 res	44	44	$42.00	$40.86
90480 Admn sarscov2 vacc 1 dose	36	36	$46.71	$40.86
91320 Sarscv2 vac 30mcg trs-suc im	34	34	$150.00	$128.48
G0009 Administration of pneumococcal vaccine	29	29	$69.32	$30.63
99349 Residence visit for established patient with moderate level of medical decision making, per day, if using time, at least 40 minutes	29	26	$192.38	$128.04
90677 Pneumococcal conjugate vaccine, 20 valent (pcv20), for intramuscular use	25	25	$309.44	$267.41
99215 Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more	24	24	$275.92	$180.45
81003 Automated urinalysis test	23	22	$4.29	$2.09
87428 Detection test by immunoassay technique for severe acute respiratory syndrome coronavirus and influenza	12	12	$25.00	$24.50
99204 New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more	12	12	$252.06	$167.78

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
J0897 Injection, denosumab, 1 mg	3,450	35	$25.70	$21.17
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	818	495	$224.00	$131.02
99213 Established patient office or other outpatient visit, typically 15 minutes	547	361	$153.04	$93.11
G0439 Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit	453	453	$254.46	$134.72
G0008 Administration of influenza virus vaccine	149	146	$69.01	$29.95
90694 Influenza vaccine, quadrivalent inactivated, 0.5 ml dosage	134	134	$83.00	$69.73
96372 Injection beneath the skin or into muscle for therapy, diagnosis, or prevention	100	47	$31.88	$14.62
93000 Routine ekg using at least 12 leads including interpretation and report	85	81	$31.75	$14.74
G0009 Administration of pneumococcal vaccine	77	77	$51.78	$29.76
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	76	74	$42.00	$39.87
0124A Fee covid-19 vac 13 res	70	70	$42.00	$38.99
81003 Automated urinalysis test	58	49	$5.00	$2.22
90677 Pneumococcal conjugate vaccine, 20 valent (pcv20), for intramuscular use	56	56	$304.13	$273.28
99441 Telephone medical discussion with physician, 5-10 minutes	39	38	$93.00	$57.66
G0402 Initial preventive physical examination; face-to-face visit, services limited to new beneficiary during the first 12 months of medicare enrollment	34	34	$342.00	$172.36
G0403 Electrocardiogram, routine ecg with 12 leads; performed as a screening for the initial preventive physical examination with interpretation and report	27	27	$32.11	$14.72
99442 Telephone medical discussion with physician, 11-20 minutes	26	25	$153.00	$92.94
99495 Transitional care management services for problem of at least moderate complexity	18	16	$389.94	$211.74
90732 Vaccine for pneumococcal polysaccharide for injection beneath the skin or into muscle, patient 2 years or older	17	17	$139.94	$132.84
0004A Fee covid-19 vac 1 res	16	16	$42.00	$40.05
99211 Office or other outpatient visit for the evaluation and management of established patient that may not require presence of healthcare professional	14	13	$47.00	$24.16
69210 Removal of impacted ear wax	11	11	$100.00	$49.17
G0438 Annual wellness visit; includes a personalized prevention plan of service (pps), initial visit	11	11	$349.09	$172.67

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
J0897 Injection, denosumab, 1 mg	4,020	38	$28.00	$20.36
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	771	459	$224.00	$132.93
G0439 Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit	409	409	$240.00	$136.75
99213 Established patient office or other outpatient visit, typically 15 minutes	402	262	$153.00	$93.64
G0008 Administration of influenza virus vaccine	134	134	$34.00	$17.34
90662 Influenza vaccine split virus, preservative free	129	129	$71.88	$65.16
96372 Injection beneath the skin or into muscle for therapy, diagnosis, or prevention	112	50	$34.00	$14.59
93000 Routine ekg using at least 12 leads including interpretation and report	91	84	$35.00	$15.18
0003A Adm sarscov2 30mcg/0.3ml 3rd	62	62	$42.00	$40.05
G0009 Administration of pneumococcal vaccine	36	36	$34.00	$17.35
99442 Telephone medical discussion with physician, 11-20 minutes	30	28	$153.00	$94.61
81003 Automated urinalysis test	28	26	$5.00	$2.25
G0402 Initial preventive physical examination; face-to-face visit, services limited to new beneficiary during the first 12 months of medicare enrollment	27	27	$342.00	$173.91
90732 Vaccine for pneumococcal polysaccharide for injection beneath the skin or into muscle, patient 2 years or older	26	26	$139.00	$119.69
0004A Fee covid-19 vac 1 res	24	24	$42.00	$40.71
G0403 Electrocardiogram, routine ecg with 12 leads; performed as a screening for the initial preventive physical examination with interpretation and report	21	21	$35.00	$15.24
69210 Removal of impacted ear wax	20	16	$107.50	$46.94
99495 Transitional care management services for problem of at least moderate complexity	18	17	$338.00	$212.70
99204 New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more	17	17	$339.00	$164.12
99441 Telephone medical discussion with physician, 5-10 minutes	16	16	$93.00	$57.99
99215 Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more	15	12	$300.00	$187.18
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	14	14	$42.00	$40.71
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	14	14	$42.00	$40.71
G0438 Annual wellness visit; includes a personalized prevention plan of service (pps), initial visit	12	12	$355.00	$173.55
90670 Pneumococcal vaccine for injection into muscle	11	11	$275.00	$240.36

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
J0897 Injection, denosumab, 1 mg	3,840	41	$27.03	$19.35
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	591	372	$224.00	$111.75
99213 Established patient office or other outpatient visit, typically 15 minutes	526	343	$153.00	$76.96
G0439 Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit	338	338	$240.00	$120.08
G0008 Administration of influenza virus vaccine	148	142	$34.00	$17.08
90662 Influenza vaccine split virus, preservative free	140	134	$66.49	$60.15
96372 Injection beneath the skin or into muscle for therapy, diagnosis, or prevention	103	48	$34.00	$13.64
93000 Routine ekg using at least 12 leads including interpretation and report	94	86	$35.00	$17.17
99442 Telephone medical discussion with physician, 11-20 minutes	77	64	$124.03	$71.56
99441 Telephone medical discussion with physician, 5-10 minutes	69	66	$81.70	$43.65
G0009 Administration of pneumococcal vaccine	67	67	$34.00	$16.88
90732 Vaccine for pneumococcal polysaccharide for injection beneath the skin or into muscle, patient 2 years or older	61	61	$137.39	$116.38
81003 Automated urinalysis test	44	35	$5.00	$2.23
G0402 Initial preventive physical examination; face-to-face visit, services limited to new beneficiary during the first 12 months of medicare enrollment	31	31	$342.42	$172.41
99203 New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more	31	31	$224.00	$111.58
G0403 Electrocardiogram, routine ecg with 12 leads; performed as a screening for the initial preventive physical examination with interpretation and report	26	26	$35.00	$17.71
99204 New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more	19	19	$339.00	$170.37
G2012 Brief communication technology-based service, e.g. virtual check-in, by a physician or other qualified health care professional who can report evaluation and management services, provided to an established patient, not originating from a related e/m servic	13	13	$30.00	$14.94
99443 Telephone medical discussion with physician, 21-30 minutes	12	12	$212.17	$110.53
83036 Hemoglobin A1C level	12	11	$22.00	$9.63

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
J0897 Injection, denosumab, 1 mg	4,140	44	$23.25	$18.62
99213 Established patient office or other outpatient visit, typically 15 minutes	870	447	$166.40	$76.08
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	856	450	$222.85	$110.82
G0439 Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit	355	355	$240.94	$118.84
G0008 Administration of influenza virus vaccine	133	128	$34.84	$16.88
90662 Influenza vaccine split virus, preservative free	115	111	$58.48	$54.62
93000 Routine ekg using at least 12 leads including interpretation and report	114	104	$35.00	$17.25
96372 Injection beneath the skin or into muscle for therapy, diagnosis, or prevention	111	53	$38.32	$15.83
81003 Automated urinalysis test	80	65	$5.47	$2.41
G0009 Administration of pneumococcal vaccine	43	43	$36.79	$16.88
83036 Hemoglobin A1C level	26	23	$22.92	$10.57
G0402 Initial preventive physical examination; face-to-face visit, services limited to new beneficiary during the first 12 months of medicare enrollment	24	24	$343.58	$170.77
90732 Vaccine for pneumococcal polysaccharide for injection beneath the skin or into muscle, patient 2 years or older	24	24	$129.67	$110.87
99495 Transitional care management services for problem of at least moderate complexity	22	21	$339.27	$168.47
90670 Pneumococcal vaccine for injection into muscle	19	19	$244.58	$208.39
90686 Vaccine for influenza for administration into muscle, 0.5 ml dosage	19	18	$24.89	$17.67
G0403 Electrocardiogram, routine ecg with 12 leads; performed as a screening for the initial preventive physical examination with interpretation and report	18	18	$35.00	$17.59
99203 New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more	13	13	$224.00	$111.59
99204 New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more	12	12	$340.83	$169.24

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
J0897 Injection, denosumab, 1 mg	4,260	42	$19.96	$17.86
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	859	435	$222.00	$108.72
99213 Established patient office or other outpatient visit, typically 15 minutes	746	373	$176.00	$73.98
G0439 Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit	310	310	$241.03	$118.33
G0008 Administration of influenza virus vaccine	172	169	$42.64	$20.58
90662 Influenza vaccine split virus, preservative free	158	155	$33.36	$30.08
96372 Injection beneath the skin or into muscle for therapy, diagnosis, or prevention	117	50	$47.08	$20.77
93000 Routine ekg using at least 12 leads including interpretation and report	92	79	$35.00	$17.36
81002 Urinalysis, manual test	58	43	$6.55	$3.41
G0009 Administration of pneumococcal vaccine	45	45	$46.40	$20.82
90670 Pneumococcal vaccine for injection into muscle	30	30	$295.33	$197.34
G0402 Initial preventive physical examination; face-to-face visit, services limited to new beneficiary during the first 12 months of medicare enrollment	25	25	$344.56	$169.19
G0403 Electrocardiogram, routine ecg with 12 leads; performed as a screening for the initial preventive physical examination with interpretation and report	18	18	$35.00	$17.47
69210 Removal of impacted ear wax	15	14	$101.67	$50.02
90732 Vaccine for pneumococcal polysaccharide for injection beneath the skin or into muscle, patient 2 years or older	14	14	$136.79	$105.59
90686 Vaccine for influenza for administration into muscle, 0.5 ml dosage	13	13	$24.00	$18.65
94640 Inhalation treatment for airway obstruction or sputum production	12	11	$38.58	$19.22
83036 Hemoglobin A1C level	11	11	$25.36	$11.75
99204 New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more	11	11	$339.91	$168.33
81003 Automated urinalysis test	11	11	$5.45	$2.71

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
J0897 Injection, denosumab, 1 mg	2,341	28	$17.72	$16.59
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	708	384	$221.24	$108.41
99213 Established patient office or other outpatient visit, typically 15 minutes	707	384	$162.72	$74.08
G0439 Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit	258	258	$240.00	$117.70
G0008 Administration of influenza virus vaccine	146	136	$53.00	$25.54
90662 Influenza vaccine split virus, preservative free	132	124	$84.76	$46.57
96372 Injection beneath the skin or into muscle for therapy, diagnosis, or prevention	91	42	$52.40	$25.21
G0009 Administration of pneumococcal vaccine	87	86	$53.00	$25.59
81002 Urinalysis, manual test	65	49	$7.00	$3.38
93000 Routine ekg using at least 12 leads including interpretation and report	60	56	$35.00	$17.36
90670 Pneumococcal vaccine for injection into muscle	48	48	$310.67	$181.31
90732 Vaccine for pneumococcal polysaccharide for injection beneath the skin or into muscle, patient 2 years or older	37	37	$134.59	$92.63
J3420 Injection, vitamin b-12 cyanocobalamin, up to 1000 mcg	25	12	$4.04	$2.80
G0402 Initial preventive physical examination; face-to-face visit, services limited to new beneficiary during the first 12 months of medicare enrollment	16	16	$343.25	$168.55
90630 Vaccine for influenza for injection into skin	14	12	$42.93	$19.93
69210 Removal of impacted ear wax	11	11	$103.00	$50.39

Medical Specialties & State Licenses

Internal Medicine Primary Specialty

NUCC Taxonomy Code: 207R00000X

State License DE C2-0009051

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 OH 58002204

Hospital & Practice Group Affiliations

Core Concierge Primary Care And Wellness Llc

19330 Lighthouse Plaza Blvd, Rehoboth Beach, DE 199716161

Phone: 3025858555

Practice Associates & Co-Workers

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

12 Associated Practitioners

Dr. George Kluchnik , MD

Hospitalist

NPI 1023133618

Doctor of Medicine (M.D.)

Vanessa Adams

Nurse Practitioner

NPI 1093856320

Dr. Harry Anagnostakos , DO

Internal Medicine - Gastroenterology

NPI 1124036017

Doctor of Osteopathic Medicine (D.O.)

Dr. Mansour Saberi , MD

Internal Medicine

NPI 1134120520

Doctor of Medicine (M.D.)

Dr. Scott Olewiler , MD

Internal Medicine - Infectious Disease

NPI 1205881893

Doctor of Medicine (M.D.)

Terry Hess , NNP-BC

Nurse Practitioner - Neonatal

NPI 1417196445

NNPBC

Career & Practice History Timeline

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

6 Historical Events

✅

NPI Profile Active February 10, 2011

NPI status registered as active in NPPES database

📍

Updated Practice Location February 10, 2011

Registered at 16295 WILLOW CREEK RD, LEWES, DE 199583614 (Tel: 3026453555)

📍

Updated Business Mailing Address February 10, 2011

Registered at 15012 OYSTER SHELL DR, MILTON, DE 199683795 (Tel: 3027032563)

👤

Provider Name / Credentials Updated February 10, 2011

Recorded as KATHRYN GRINNEN, DO

🎓

Medical Taxonomy / Specialty Registered (Primary Specialty) February 10, 2011

Internal Medicine (License #C2-0009051 in DE)

🟢

Initial NPI Registration & Enumeration April 13, 2007

First registered as active Individual Practitioner in NPPES Database.

Patient & Community Reviews

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NPI Administrative Meta

NPI Number: 1710102124

Entity Type:

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

Enumeration Date: April 13, 2007

Last Update: February 10, 2011

Sole Proprietor: No

Update or Correct Profile

Mailing Address

15012 Oyster Shell Dr

Milton, DE 199683795

Phone: 3027032563

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.