Active NPI 1598922874 Individual Practitioner Male Practitioner

Dr. Jonathan Gamss , MD

Internal Medicine • Mount Kisco, NY

✓ Accepts Medicare Assignment Telehealth Available

Professional Overview & Biography Verified Profile Summary

Dr. Jonathan Gamss, MD is a certified Internal Medicine practicing in Mount Kisco, NY. With approximately 22 years of clinical experience since completing medical education in 2004, Dr. Gamss delivers high-quality medical care to the local community at 400 E MAIN ST.

Dr. Gamss maintains professional affiliations with Rwjbh Emergency Medicine Associates, Llc, Vladimir Zelenko Md Pc and accepts Medicare assignment . Telehealth and virtual consultation options are available for eligible patients.

Frequently performed procedures and clinical services include emergency department visit for life threatening or functioning severity, established patient outpatient office visit, emergency department visit with moderate level of medical decision making. Full Medicare procedure pricing transparency rates and service volume details are listed on this profile.

Practice Location & Contact Primary Location

Practice Address

400 E Main St
Northern Westchester Hospital

Mount Kisco, NY 105493417

Telephone 9146661680

Fax 9146661965

Associated Practice Facility / Clinic

🏢 Northern Westchester Hospital Association Facility NPI 1912992215

Medicare Profile & Education

Medical School

Other

Graduation Year

2004

Medicare Assignment

✓ Accepts Assignment

Telehealth Flag

Telehealth Services Available

Specialty Benchmarks & Practice Insights

Comparative analytics for Internal Medicine in Mount Kisco, NY

Senior Veteran Specialist (>20 Yrs)

Practitioner Clinical Experience

22 Yrs -7.3 yrs vs City Avg

City Avg: 29.3 Yrs

State Avg: 29.4 Yrs

Regional Practice Density

44 Specialists

Practicing in Mount Kisco, NY (12979 Statewide)

Telehealth Adoption Rate

20.5% Regional Adoption

✓ Offers Virtual Consultations

Medicare Pricing Discount

82.1% Avg Savings

Under CMS Medicare Fee Schedule vs Standard Submitted Charges

Clinical Seniority & Experience Comparison

Dr. Gamss (22 Years) 22 Yrs

Mount Kisco Specialty Average (29.3 Years) 29.3 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
99285 Emergency department visit for life threatening or functioning severity	430	401	$1107.40	$179.63
99213 Established patient office or other outpatient visit, typically 15 minutes	78	61	$247.44	$96.96
99284 Emergency department visit with moderate level of medical decision making	71	66	$762.90	$124.96
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	58	52	$247.41	$136.40
99291 Critical care, first 30-74 minutes	33	32	$1856.06	$218.00
99223 Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes	28	26	$1103.00	$176.05
87880 Detection test by immunoassay with direct visual observation for streptococcus, group a (strep)	12	12	$50.00	$16.20
87811 Detection test by immunoassay with direct visual observation for severe acute respiratory syndrome coronavirus 2 (covid-19)	11	11	$150.00	$40.55

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99285 Emergency department visit for life threatening or functioning severity	302	296	$1450.77	$189.37
99213 Established patient office or other outpatient visit, typically 15 minutes	89	75	$159.75	$98.09
93042 Interpretation and report of electrical activity of heart using 1-3 leads	88	88	$58.73	$7.33
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	83	77	$195.33	$136.74
99284 Emergency department visit with moderate level of medical decision making	71	61	$1018.42	$130.37
99291 Critical care, first 30-74 minutes	33	33	$1953.45	$218.64
99204 New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more	26	26	$225.48	$168.69
87811 Detection test by immunoassay with direct visual observation for severe acute respiratory syndrome coronavirus 2 (covid-19)	26	26	$97.02	$40.55
99203 New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more	22	22	$167.48	$119.04
87804 Detection test by immunoassay with direct visual observation for influenza virus	21	11	$37.60	$16.22
99212 Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more	15	15	$122.77	$63.16
87880 Detection test by immunoassay with direct visual observation for streptococcus, group a (strep)	15	15	$47.75	$16.18
G0439 Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit	11	11	$239.83	$137.70
87636 Detection test by multiplex amplified probe technique for severe acute respiratory syndrome coronavirus 2 (sars-cov-2) (covid-19) and influenza virus types a and b	11	11	$228.47	$139.78

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99285 Emergency department visit for life threatening or functioning severity	422	401	$1500.00	$194.03
99211 Office or other outpatient visit for the evaluation and management of established patient that may not require presence of healthcare professional	179	147	$87.12	$27.52
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	134	92	$201.78	$133.38
87811 Detection test by immunoassay with direct visual observation for severe acute respiratory syndrome coronavirus 2 (covid-19)	127	111	$119.69	$41.02
99284 Emergency department visit with moderate level of medical decision making	114	110	$991.05	$136.70
99213 Established patient office or other outpatient visit, typically 15 minutes	100	82	$143.79	$95.24
93042 Interpretation and report of electrical activity of heart using 1-3 leads	75	74	$62.00	$7.46
99291 Critical care, first 30-74 minutes	65	64	$1975.57	$241.21
99283 Emergency department visit with low level of medical decision making	50	45	$591.36	$77.62
87804 Detection test by immunoassay with direct visual observation for influenza virus	48	22	$41.25	$16.30
36415 Insertion of needle into vein for collection of blood sample	43	38	$50.00	$2.94
G0008 Administration of influenza virus vaccine	36	36	$35.00	$32.17
90694 Influenza vaccine, quadrivalent inactivated, 0.5 ml dosage	35	35	$74.86	$70.20
96372 Injection beneath the skin or into muscle for therapy, diagnosis, or prevention	33	24	$60.00	$14.89
99212 Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more	30	26	$98.33	$59.17
87636 Detection test by multiplex amplified probe technique for severe acute respiratory syndrome coronavirus 2 (sars-cov-2) (covid-19) and influenza virus types a and b	30	29	$290.00	$140.92
87635 Amplifed dna or rna probe detection of severe acute respiratory syndrome coronavirus 2 (covid-19) antigen	25	23	$176.00	$50.53
87880 Detection test by immunoassay with direct visual observation for streptococcus, group a (strep)	24	23	$50.00	$16.21
99442 Telephone medical discussion with physician, 11-20 minutes	21	21	$150.00	$94.23
99220 Hospital observation care, typically 70 minutes	20	20	$1476.60	$199.86
J3420 Injection, vitamin b-12 cyanocobalamin, up to 1000 mcg	19	13	$10.00	$1.82
G0439 Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit	17	17	$250.00	$132.95
93000 Routine ekg using at least 12 leads including interpretation and report	15	15	$60.00	$15.13
99204 New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more	15	15	$378.31	$182.81
71046 X-ray of chest, 2 views	14	13	$101.36	$36.16
99217 Hospital observation care on day of discharge	13	13	$535.08	$82.86
M0247 Intravenous infusion, sotrovimab, includes infusion and post administration monitoring	12	12	$1166.67	$532.74
99202 New patient office or other outpatient visit, typically 20 minutes	12	12	$191.34	$79.38

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99285 Emergency department visit for life threatening or functioning severity	465	433	$1516.26	$195.67
99284 Emergency department visit with moderate level of medical decision making	132	125	$1020.98	$136.38
99283 Emergency department visit with low level of medical decision making	127	96	$593.83	$79.16
93010 Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only	63	61	$77.81	$9.17
99291 Critical care, first 30-74 minutes	49	49	$1952.14	$242.06
99442 Telephone medical discussion with physician, 11-20 minutes	47	37	$150.00	$102.18
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	42	40	$200.00	$143.95
99213 Established patient office or other outpatient visit, typically 15 minutes	42	40	$140.00	$101.54
87804 Detection test by immunoassay with direct visual observation for influenza virus	26	13	$40.00	$16.55
M0240 Intravenous infusion or subcutaneous injection, casirivimab and imdevimab includes infusion or injection, and post administration monitoring, subsequent repeat doses	21	21	$1019.05	$529.45
87811 Detection test by immunoassay with direct visual observation for severe acute respiratory syndrome coronavirus 2 (covid-19)	19	18	$150.00	$41.38
99204 New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more	16	16	$428.75	$190.34

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99285 Emergency department visit for life threatening or functioning severity	343	326	$1466.59	$191.66
93042 Interpretation and report of electrical activity of heart using 1-3 leads	112	110	$68.00	$7.69
99284 Emergency department visit with moderate level of medical decision making	89	88	$947.98	$135.55
99291 Critical care, first 30-74 minutes	80	79	$1810.64	$246.62
99283 Emergency department visit with low level of medical decision making	76	64	$604.25	$72.48
93010 Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only	43	42	$74.00	$9.46
99220 Hospital observation care, typically 70 minutes	19	16	$1330.63	$207.38
99217 Hospital observation care on day of discharge	16	16	$519.81	$84.36
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	12	12	$200.00	$119.76

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99285 Emergency department visit for life threatening or functioning severity	535	500	$1476.66	$185.74
93042 Interpretation and report of electrical activity of heart using 1-3 leads	158	153	$68.00	$7.59
99284 Emergency department visit with moderate level of medical decision making	152	150	$936.26	$128.96
99291 Critical care, first 30-74 minutes	86	81	$1766.35	$239.72
99283 Emergency department visit with low level of medical decision making	83	82	$617.88	$67.36
99220 Hospital observation care, typically 70 minutes	26	26	$1264.23	$204.40

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99285 Emergency department visit for life threatening or functioning severity	563	520	$1503.00	$182.99
93010 Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only	361	334	$116.00	$9.05
99284 Emergency department visit with moderate level of medical decision making	201	194	$1000.83	$124.49
99283 Emergency department visit with low level of medical decision making	84	79	$676.13	$65.09
99291 Critical care, first 30-74 minutes	76	75	$1760.99	$236.90
99220 Hospital observation care, typically 70 minutes	36	36	$1358.83	$201.62
93042 Interpretation and report of electrical activity of heart using 1-3 leads	14	14	$68.00	$7.54

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99285 Emergency department visit for life threatening or functioning severity	523	492	$1116.11	$184.01
93010 Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only	472	450	$37.42	$9.11
99284 Emergency department visit with moderate level of medical decision making	174	171	$750.38	$124.83
99283 Emergency department visit with low level of medical decision making	87	84	$481.06	$65.93
99291 Critical care, first 30-74 minutes	62	60	$1039.02	$239.47
99220 Hospital observation care, typically 70 minutes	43	43	$923.00	$200.48
99219 Hospital observation care, typically 50 minutes	16	16	$369.88	$146.68
99217 Hospital observation care on day of discharge	14	14	$313.00	$79.09

Medical Specialties & State Licenses

CMS Verified: 2026-06-11

Internal Medicine Primary Specialty

NUCC Taxonomy Code: 207R00000X

State License NY 246486

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 FL ME178297

Internal Medicine

NUCC Taxonomy Code: 207R00000X

State License CO DR.0076561

Emergency Medicine

NUCC Taxonomy Code: 207P00000X

State License NJ 25MA08623200

An emergency physician focuses on the immediate decision making and action necessary to prevent death or any further disability both in the pre-hospital setting by directing emergency medical technicians and in the emergency department. The emergency physician provides immediate recognition, evaluation, care, stabilization and disposition of a generally diversified population of adult and pediatric patients in response to acute illness and injury.

Additional State Medicaid & Healthcare Payer Identifiers

Medicaid State Provider ID

03040282 (NY)

Hospital & Practice Group Affiliations

Rwjbh Emergency Medicine Associates, Llc

225 Williamson St, Elizabeth, NJ 072023625

Phone: 9089945422

Rwjbh Emergency Medicine Associates, Llc

1 Clara Maass Dr, Belleville, NJ 071093550

Phone: 9734502000

Vladimir Zelenko Md Pc

3 Hamaspik Way, Monroe, NY 109508625

Phone: 8457820000

Secondary Practice Locations

391 E 149th St Ste 403

Bronx, NY 104553907

Phone: 7188196144

10465 Melody Dr Ste 123

Northglenn, CO 802344101

Phone: 7188196144

15310 Amberly Dr # 66

Tampa Palms, FL 336472199

Phone: 7188196144

3611 14th Ave Ste 550

Brooklyn, NY 112183773

Phone: 7188196144

Practice Associates & Co-Workers

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

16 Associated Practitioners

Sandra Broadhurst , FNP

Nurse Practitioner - Family

NPI 1104927532

Family Nurse Practitioner

Dr. Sherri Sandel , MD

Hospitalist

NPI 1285777011

Doctor of Medicine (M.D.)

Julia Ashbey-Pejoves , RD

Dietitian, Registered

NPI 1366886038

Registered Dietitian

Kathryn Brandt , RPH

Pharmacist

NPI 1376601203

Registered Pharmacist

Dr. Charlie Zhao , MD

Hospitalist

NPI 1497140214

Doctor of Medicine (M.D.)

Dr. Adam Hirsch , DO

Hospitalist

NPI 1528053915

Doctor of Osteopathic Medicine (D.O.)

Career & Practice History Timeline

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

10 Historical Events

🎓

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

Internal Medicine (License #246486 in NY)

🎓

Medical Taxonomy / Specialty Registered (Primary Specialty) July 29, 2025

Emergency Medicine (License #25MA08623200 in NJ)

🎓

Medical Taxonomy / Specialty Registered (Primary Specialty) November 18, 2024

Internal Medicine (License #246486 in NY)

🎓

Medical Taxonomy / Specialty Registered (Primary Specialty) November 20, 2020

Emergency Medicine (License #25MA08623200 in NJ)

✅

NPI Profile Active May 22, 2008

NPI status registered as active in NPPES database

📍

Updated Practice Location May 22, 2008

Registered at 400 E MAIN ST, NORTHERN WESTCHESTER HOSPITAL, MOUNT KISCO, NY 105493417 (Tel: 9146661680)

📍

Updated Business Mailing Address May 22, 2008

Registered at 400 E MAIN ST, NORTHERN WESTCHESTER HOSPITAL, MEDICAL AFFAIRS OFFICE, MOUNT KISCO, NY 105493417 (Tel: 9146661680)

👤

Provider Name / Credentials Updated May 22, 2008

Recorded as JONATHAN GAMSS, M.D.

🎓

Medical Taxonomy / Specialty Registered (Primary Specialty) May 22, 2008

Internal Medicine (License #246486 in NY)

🟢

Initial NPI Registration & Enumeration May 22, 2008

First registered as active Individual Practitioner in NPPES Database.

Patient & Community Reviews

Verified patient ratings, medical care experiences, and facility photos

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NPI Administrative Meta

NPI Number: 1598922874

Entity Type:

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

Enumeration Date: May 22, 2008

Last Update: June 11, 2026

Sole Proprietor: No

Update or Correct Profile

Mailing Address

400 E Main St, Northern Westchester Hospital, Medical Affairs Office

Mount Kisco, NY 105493417

Phone: 9146661680

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.