Dr. John A Gelzhiser , MD
Internal Medicine • Warwick, RI
455 Toll Gate Rd
Warwick, RI 028862759
This profile restates public CMS/NPPES data; T-MedInfo gives no medical advice — consult a licensed professional, and call 911 for emergencies.
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Dr. John Gelzhiser is listed in NPPES under Internal Medicine.
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NPI assigned on August 27, 2007; this date does not establish years in practice.
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Published CMS data list 789 Original Medicare Part B services in 2024.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2024. Published rows only; this is not a quality measure.
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Published Part B service records, 2024:
- 99309 — Subsequent nursing facility care with moderate level of medical decision making, per day: 283 service units.
- 99306 — Initial nursing facility care with high level of medical decision making, per day: 202 service units.
- 99309 — Subsequent nursing facility care with moderate level of medical decision making, per day: 110 service units.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2024. Units differ by code; these are not visits or a measure of quality.
CPT® only copyright 2023 American Medical Association. All rights reserved. Service names are shortened from CPT Consumer Friendly Descriptors (CMS data, 2024). CPT notice
See all 7 records in the table · Guide: How to read Medicare Part B data
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Published CMS data list 17,591 Medicare Part D prescriptions, including refills, in 2024.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2024. Published rows only; this is not a quality measure.
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Published Part D records, 2024:
- Atorvastatin Calcium — 980 prescription fills, including refills.
- Eliquis (Apixaban) — 936 prescription fills, including refills.
- Trazodone Hcl — 908 prescription fills, including refills.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2024. Drug names come from pharmacy claims. Listing a drug here is not an endorsement or a recommendation.
See all 198 records in the table · Guide: How to read Medicare Part D prescriber data
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More Medicare Part B services than 85% of clinicians listed under Internal Medicine in Warwick, RI (2024, 48 clinicians with data). Median for this group: 492. Middle half: 312 to 580.
More Medicare Part B services than 75% of clinicians listed under Internal Medicine in Rhode Island (2024, 529 clinicians with data). Median for this group: 396. Middle half: 234 to 705.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2024. Billing and prescribing volume is not a quality rating.
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Medicare Part B services went from 241 in 2020 to 789 in 2024.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2020–2024.
Practice Location & Contact Primary Location
455 Toll Gate Rd
Warwick, RI 028862759
Matched by practice address or phone in NPPES. A shared address or phone does not confirm that this clinician works there.
CMS Doctors and Clinicians lists 1 group name: Affinity Physicians Llc.. See the list
Source: CMS Doctors and Clinicians National Downloadable File, release date unavailable.
Listings do not confirm current availability, employment or a shared ownership network.
Medicare Profile & Education
Source: CMS Doctors and Clinicians National Downloadable File
2004
What Public CMS Data Show
Internal Medicine: NPPES taxonomy is a reported classification, not proof of board certification.
Medicare patients
364 people with Original Medicare in 2024
It gives a sense of how many people with Medicare this clinician treated that year.
Source: CMS, Medicare Physician & Other Practitioners – by Provider, 2024.
Medicare-allowed amount
About $107,739 in 2024
The total amount Medicare approved for these services in 2024. It includes what Medicare paid and what patients or their other insurance owed, such as the deductible and coinsurance.
It shows the total cost of this clinician's Original Medicare services under Medicare's fee rules.
What this does not show: Medicare-allowed amount
This is not the clinician's income. Part of it can go to a clinic or group practice, staff, equipment or drugs. It is not the price you will pay.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2024.
Paid by Medicare
About $80,261 in 2024
The part of the Medicare-allowed amount that Medicare itself paid in 2024, after patients' deductibles and coinsurance.
The gap between the allowed amount and this number is roughly what patients and their other insurance paid.
What this does not show: Paid by Medicare
This is not the clinician's income and not a measure of quality.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2024.
30-day fills
17,608 standardized 30-day fills in 2024
CMS converts prescriptions to 30-day supplies so they can be compared. A 90-day prescription counts as about three 30-day fills.
What this does not show: 30-day fills
It is not a count of patients and not a measure of quality.
Part D drug cost
$1,151,149 in 2024
The total cost of these prescriptions in 2024, paid by Medicare drug plans, patients and other payers together.
It shows the total spending on drugs this clinician prescribed, not what any one patient paid.
What this does not show: Part D drug cost
A higher cost often reflects the type of medicines a specialty uses. It is not your out-of-pocket cost and not a measure of quality.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2024.
Industry payments (Open Payments)
No Open Payments records are listed for this clinician for 2019–2025.
Years since graduation
22 years (graduated 2004)
CMS Doctors and Clinicians data list 2004 as the year this clinician finished professional school.
It tells you roughly how long ago the clinician finished school.
What this does not show: Years since graduation
It is not the number of years in practice, and more years does not mean better care.
Source: CMS Doctors and Clinicians National Downloadable File.
NPI first issued
2007
The year this clinician's National Provider Identifier (NPI) was issued. An NPI is a unique 10-digit ID that US health care providers use for billing.
What this does not show: NPI first issued
NPIs have been issued only since 2005, so this year is not necessarily when the clinician started practicing.
Source: CMS NPPES NPI Registry.
Accepts Medicare assignment
CMS data list this clinician as accepting Medicare assignment. This means agreeing to take the Medicare-approved amount as full payment for covered services.
With Original Medicare, you usually pay only your deductible and coinsurance, and the office sends the claim to Medicare for you.
Medicare assignment applies to Original Medicare. It does not tell you whether the clinician is in a Medicare Advantage plan's network, accepts other insurance, or is taking new patients.
Source: CMS Doctors and Clinicians; Medicare.gov, “Does your provider accept Medicare as full payment?”
No telehealth indicator
CMS shows this indicator only when recent Medicare claims include telehealth services. The clinician may still offer telehealth; ask the office.
Source: CMS, Telehealth Indicator on Medicare Care Compare (fact sheet, January 2023); CMS Doctors and Clinicians.
Enrolled in Medicare (PECOS)
Dr. Gelzhiser has a Medicare enrollment record in PECOS, the CMS system clinicians use to enroll so they can bill Medicare or order services for people with Medicare.
It does not show whether the clinician accepts assignment, is in your plan's network, or is taking new patients.
Source: CMS Medicare Fee-For-Service Public Provider Enrollment (PECOS); CMS Order and Referring file.
Can order Medicare-covered services
CMS lists Dr. Gelzhiser as eligible to order or refer Medicare Part B clinical laboratory and imaging services, durable medical equipment (DME) and home health services for people with Medicare.
Medicare pays for these items and services only when they are ordered by an eligible clinician.
What this does not show: Can order Medicare-covered services
It does not mean the clinician offers these services directly.
Source: CMS Medicare Fee-For-Service Public Provider Enrollment (PECOS); CMS Order and Referring file.
Compared with the same specialty in Warwick and Rhode Island
Billing and prescribing volume is not a quality rating.
Medicare Part B services
More Medicare Part B services than 85% of clinicians listed under Internal Medicine in Warwick, RI (2024, 48 clinicians with data). Median for this group: 492. Middle half: 312 to 580.
More Medicare Part B services than 75% of clinicians listed under Internal Medicine in Rhode Island (2024, 529 clinicians with data). Median for this group: 396. Middle half: 234 to 705.
Medicare-allowed amount
A higher Medicare-allowed amount than 95% of clinicians listed under Internal Medicine in Warwick, RI (2024, 48 clinicians with data). Median for this group: $48,692. Middle half: $35,546 to $56,827.
A higher Medicare-allowed amount than 90% of clinicians listed under Internal Medicine in Rhode Island (2024, 529 clinicians with data). Median for this group: $38,752. Middle half: $20,970 to $59,070.
Paid by Medicare
A higher Medicare payment amount than 95% of clinicians listed under Internal Medicine in Warwick, RI (2024, 48 clinicians with data). Median for this group: $36,088. Middle half: $26,174 to $45,154.
A higher Medicare payment amount than 90% of clinicians listed under Internal Medicine in Rhode Island (2024, 529 clinicians with data). Median for this group: $28,221. Middle half: $15,243 to $44,860.
Medicare Part D prescriptions
More Part D prescriptions than 95% of clinicians listed under Internal Medicine in Warwick, RI (2024, 47 clinicians with data). Median for this group: 392. Middle half: 59 to 4,719.
More Part D prescriptions than 95% of clinicians listed under Internal Medicine in Rhode Island (2024, 581 clinicians with data). Median for this group: 749. Middle half: 91 to 5,119.
Part D drug cost
A higher Part D drug cost than 95% of clinicians listed under Internal Medicine in Warwick, RI (2024, 47 clinicians with data). Median for this group: $24,453. Middle half: $948 to $351,389.
A higher Part D drug cost than 95% of clinicians listed under Internal Medicine in Rhode Island (2024, 581 clinicians with data). Median for this group: $63,829. Middle half: $3,341 to $358,176.
120 active clinicians are listed under Internal Medicine with a practice address in Warwick, RI (1,034 in Rhode Island).
Addresses are self-reported to NPPES and may be out of date.
Telehealth indicator in Warwick
10.8% of these 120 clinicians have the CMS telehealth indicator.
45% of these 120 clinicians are listed by CMS as accepting Medicare assignment.
CMS data by year
Changes may reflect reporting, coverage or privacy limits, not changes in care quality.
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Medicare Part B services
Medicare Part B services increased 227% from 241 in 2020 to 789 in 2024.
- 2020: 241
- 2021: 1,316
- 2022: 1,517
- 2023: 915
- 2024: 789
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Medicare-allowed amount
Medicare-allowed amount increased 494% from $18,146 in 2020 to $107,739 in 2024.
- 2020: $18,146
- 2021: $120,743
- 2022: $138,325
- 2023: $119,606
- 2024: $107,739
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Paid by Medicare
Paid by Medicare increased 460% from $14,331 in 2020 to $80,261 in 2024.
- 2020: $14,331
- 2021: $96,383
- 2022: $100,846
- 2023: $89,626
- 2024: $80,261
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Medicare Part D prescriptions
Medicare Part D prescriptions went from 16 in 2015 to 17,591 in 2024.
- 2015: 16
- 2021: 2,777
- 2022: 8,880
- 2023: 15,682
- 2024: 17,591
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30-day fills
30-day fills went from 16 in 2015 to 17,608 in 2024.
- 2015: 16
- 2021: 2,804
- 2022: 8,921
- 2023: 15,695
- 2024: 17,608
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Part D drug cost
Part D drug cost went from $77 in 2015 to $1,151,149 in 2024.
- 2015: $77
- 2021: $79,344
- 2022: $417,865
- 2023: $819,900
- 2024: $1,151,149
Sources: CMS Medicare Physician & Other Practitioners (2024), CMS Medicare Part D Prescribers (2024), CMS Doctors and Clinicians, CMS NPPES NPI Registry. Specialty names follow the NUCC Health Care Provider Taxonomy.
Text: T-MedInfo · Report an error.
Performed Procedures & Service Volume
CPT® is a registered trademark of the American Medical Association. CPT codes, descriptions and other data only are copyright 2016–2023 American Medical Association. All rights reserved. Applicable FARS/HHSARS apply. Descriptions of CPT codes are the AMA's CPT Consumer Friendly Descriptors as published by CMS in the Medicare Physician & Other Practitioners – by Provider and Service data, 2017–2024; they are plain-language summaries, not for clinical coding or documentation. HCPCS Level II codes and descriptions are from CMS. Fee schedules, relative value units, conversion factors and/or related components are not assigned by the AMA, are not part of CPT, and the AMA is not recommending their use. The AMA does not directly or indirectly practice medicine or dispense medical services. The AMA assumes no liability for data contained or not contained herein.
| HCPCS Code | Services | Patients | Submitted Charge | Medicare Allowed |
|---|---|---|---|---|
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99309
Subsequent nursing facility care with moderate level of medical decision making, per day, if using time, at least 30 minutes
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283 | 124 | $210.00 | $107.28 |
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99306
Initial nursing facility care with high level of medical decision making, per day, if using time, 50 minutes or more
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202 | 167 | $381.00 | $180.92 |
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99309
Subsequent nursing facility care with moderate level of medical decision making, per day, if using time, at least 30 minutes
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110 | 56 | $210.00 | $107.40 |
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99306
Initial nursing facility care with high level of medical decision making, per day, if using time, 50 minutes or more
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109 | 88 | $381.00 | $178.38 |
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99305
Initial nursing facility care with moderate level of medical decision making, per day, if using time, at least 35 minutes
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43 | 41 | $297.00 | $132.47 |
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99308
Subsequent nursing facility care with straightforward level of medical decision making, per day, if using time, 20 minutes or more
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29 | 21 | $159.00 | $74.31 |
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99305
Initial nursing facility care with moderate level of medical decision making, per day, if using time, at least 35 minutes
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13 | 13 | $297.00 | $132.66 |
Source: CMS Part B by Provider and Service, 2024; services under 11 beneficiaries omitted by CMS. Privacy limits
Submitted charges are billed amounts, not a price quote for your visit.
Medicare Part D Prescribing Profile & Medications
Medicare Part D prescriptions filled, including refills, in 2024.
| Brand Name | Generic Name | Prescriptions | Day Supply | Total Cost | Patients |
|---|---|---|---|---|---|
| Atorvastatin Calcium | Atorvastatin Calcium | 980 | 24,480 | $18,644.82 | 293 |
| Eliquis | Apixaban | 936 | 11,703 | $247,202.02 | 136 |
| Trazodone Hcl | Trazodone Hcl | 908 | 20,486 | $16,362.32 | 167 |
| Levothyroxine Sodium | Levothyroxine Sodium | 844 | 15,008 | $9,169.61 | 150 |
| Furosemide | Furosemide | 815 | 13,575 | $6,436.99 | 154 |
| Sertraline Hcl | Sertraline Hcl | 545 | 14,576 | $9,285.54 | 95 |
| Amlodipine Besylate | Amlodipine Besylate | 427 | 10,487 | $6,296.02 | 123 |
| Metoprolol Succinate | Metoprolol Succinate | 427 | 10,042 | $9,050.91 | 136 |
| Escitalopram Oxalate | Escitalopram Oxalate | 389 | 10,517 | $7,209.67 | 80 |
| Mirtazapine | Mirtazapine | 377 | 9,873 | $12,425.12 | 111 |
| Gabapentin | Gabapentin | 375 | 8,808 | $8,867.52 | 111 |
| Metoprolol Tartrate | Metoprolol Tartrate | 340 | 8,593 | $3,745.47 | 91 |
| Lisinopril | Lisinopril | 330 | 8,630 | $5,185.23 | 86 |
| Losartan Potassium | Losartan Potassium | 292 | 7,134 | $4,957.19 | 93 |
| Pantoprazole Sodium | Pantoprazole Sodium | 271 | 6,384 | $5,340.49 | 100 |
| Donepezil Hcl | Donepezil Hcl | 238 | 6,039 | $4,931.04 | 48 |
| Metformin Hcl | Metformin Hcl | 236 | 5,959 | $3,554.79 | 67 |
| Quetiapine Fumarate | Quetiapine Fumarate | 227 | 5,766 | $4,474.97 | 49 |
| Tamsulosin Hcl | Tamsulosin Hcl | 216 | 5,119 | $4,418.70 | 77 |
| Omeprazole | Omeprazole | 213 | 4,875 | $3,290.85 | 76 |
| Warfarin Sodium | Warfarin Sodium | 208 | 1,435 | $1,097.93 | 16 |
| Duloxetine Hcl | Duloxetine Hcl | 186 | 4,293 | $6,692.85 | 41 |
| Potassium Chloride | Potassium Chloride | 179 | 3,951 | $4,346.02 | 55 |
| Jardiance | Empagliflozin | 178 | 2,278 | $49,497.58 | 36 |
| Clopidogrel | Clopidogrel Bisulfate | 165 | 4,176 | $3,417.00 | 49 |
(top 25 shown)
Source: CMS Part D by Provider and Drug, 2024; rows below 11 claims omitted by CMS; volume isn’t quality. Privacy limits
Specialties & License Numbers Reported to NPPES
NUCC Taxonomy Code: 207R00000X
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.
Additional State Medicaid & Healthcare Payer Identifiers
Medicare (PECOS) Enrollment & Ordering Eligibility
Source: CMS PECOSPRACTITIONER - INTERNAL MEDICINE
I20071130000567
RI
5799874574
Sources: CMS Provider Enrollment and Order and Referring. Medicare enrollment is a billing status, not an accreditation or quality rating.
Medicare Group Practice Enrollments
Source: CMS Doctors and Clinicians National Downloadable File
Affinity Physicians Llc.
455 Toll Gate Rd, Warwick, RI 028862759
Phone: 4017377010
Clinicians Sharing This Practice Address or Phone
Clinicians sharing this NPPES address, phone or fax; a shared contact does not mean they work together.
Internal Medicine
Doctor of Osteopathic Medicine (D.O.)
Emergency Medicine
Doctor of Osteopathic Medicine (D.O.)
Nurse Anesthetist, Certified Registered
Certified Registered Nurse Anesthetist
Physician Assistant
Physician Assistant (Certified)
Physician Assistant
Physician Assistant (Certified)
Preventive Medicine - Undersea and Hyperbaric Medicine
Doctor of Osteopathic Medicine (D.O.)
Career & Practice History
NPI enumerated August 27, 2007.
No changes to the name, practice address, taxonomy or NPI status in this record have been observed in the monthly NPPES data files from January 2017 to August 2026.
NPI Administrative Meta
Other Internal Medicine Providers in Warwick
- Dr. Irene Chliwner, MD
- Dr. Damir Mingaleev, MD
- Dr. Stephen Scott, MD
- Dr. Farhat Ibrahim, MD
- Dr. Reshma Abraham, MD
- Dr. Daniel Lukowicz, MD
More public profiles in Rhode Island
Directory navigation, in NPI number order.
- Caroline Guglielmo, DPT Physical Therapist · East Providence
- Kanwal Naveen Bains, MD Internal Medicine · Providence
- Sidra Ethier, DPT Physical Therapist · Pawtucket
- Muyide Satiregun, MD Hospitalist · Providence
- Sanford Edwards, MD Surgery · Westerly
- Christine Omerhi Pincince, RN Nurse Practitioner - Family · Wakefield
- Emily Daniell, NP Nurse Practitioner - Psychiatric/Mental Health · East Providence
- Kevin Santilli, PA-C Physician Assistant - Surgical · Providence
- Phyllis Dolcy, PHYSICIAN ASSISTANT Physician Assistant · Providence
- Lindsey Maroney, PA-C Physician Assistant · Wakefield
- Ashley Fazio, MS, CCC-SLP Speech-Language Pathologist · Coventry
- Christine Barry, DMD, MPH Dentist · Cranston
Mailing Address
455 Toll Gate Rd
Warwick, RI 028862759
Phone: 4017377000