Gregory Alexander Gandarillas, DO
Internal Medicine Physician · Philadelphia, PA
Gregory Alexander Gandarillas, DO is an internal medicine physician with a practice address in Philadelphia, Pennsylvania, and NPI 1154071579, issued on Mar 28, 2022. Check the license on the Pennsylvania Department of State (PALS); the Medicare figures below come from public CMS files.
- Name
- Gregory Alexander Gandarillas
- Credential
- DO
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- OS23768 FL
Self-reported in NPPES; status is on the state search - Practice location
- 4190 City Ave, Philadelphia, PA 19131
- Phone
- (786) 385-6968
- Enumerated
- Mar 28, 2022
- Record last updated
- Jun 29, 2026
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 7,300 in Pennsylvania → Look up another NPI →
Also registered at 4190 City Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Gregory Alexander Gandarillas in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersPennsylvania Department of State (PALS)Check the board
- 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
99% fewer Medicare Part D claims than the average internal medicine physician in 2024
29 Medicare Part D claims for 16 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D.
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Gregory Alexander Gandarillas among 7,300 internal medicine physician records in Pennsylvania
Gregory Alexander Gandarillas, DO is one of 7,300 internal medicine physician records with a practice address in Pennsylvania. 78% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2022, is newer than 85% of them.
- NPI issued2022 · 85% of these records are older, 11% newer
- In a Medicare fileYes · 78% of these records are
- In the CMS Doctors and Clinicians fileNo · 58% of these records are
- Record last updated2026 · 56% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Pennsylvania practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
1,855 internal medicine physician records list a practice address in Philadelphia
They are 1,855 of the 42,849 NPPES records with a practice address in Philadelphia, and 7,300 internal medicine physician records in Pennsylvania.
All 7,300 in Pennsylvania → Every provider in Philadelphia → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Walter Bantom, M.D.Philadelphia, PA 191311194741710
- Daniel Jones, M.D.Philadelphia, PA 191311598785115
- Azad Khan, M.DPhiladelphia, PA 191311154471621
- Karen Krich, MDPhiladelphia, PA 191311306862180
- Sumit Kumar, M.D.Philadelphia, PA 191311922259431
- Pat Lannutti, DOPhiladelphia, PA 191311356343388
- Sophie Parker, M.D.Philadelphia, PA 191311760416796
- Brian Penza, D.O.Philadelphia, PA 191311962726893
Common questions
What is Gregory Alexander Gandarillas, DO's NPI number?
Gregory Alexander Gandarillas, DO's National Provider Identifier (NPI) is 1154071579, issued on Mar 28, 2022. An NPI identifies a provider in billing; it is not a license.
Where is Gregory Alexander Gandarillas, DO located?
The NPPES record lists a practice address at 4190 City Ave, Philadelphia, PA, 19131. Phone: (786) 385-6968. Providers update this record themselves, so call before visiting.
How can I verify Gregory Alexander Gandarillas, DO's license?
Search the Pennsylvania Department of State (PALS) at https://www.pals.pa.gov/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Gregory Alexander Gandarillas, DO prescribe under Medicare Part D?
In 2024, Gregory Alexander Gandarillas, DO had 29 Medicare Part D claims for 16 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.