Mary Mahler, MD
Medical Oncology Physician · Philadelphia, PA
Mary Mahler, MD is a medical oncology physician with a practice address in Philadelphia, Pennsylvania, and NPI 1326703927, issued on Nov 8, 2021. Check the license (Pennsylvania MD475737, as entered in NPPES) on the Pennsylvania Department of State (PALS); the Medicare figures below come from public CMS files.
- Name
- Mary Mahler
- Credential
- MD
- Primary taxonomy
- Medical Oncology Physician 207RX0202X
- License number
- MD475737 PA
Self-reported in NPPES; status is on the state search - Practice location
- 51 N 39TH St, Philadelphia, PA 19104
- Phone
- (215) 662-9801
- Enumerated
- Nov 8, 2021
- Record last updated
- Nov 8, 2021 (not updated in 5 years: call before relying on the address or phone)
- Entity
- Type 1 · individual
8 nearest medical oncology physician records → All 265 in Pennsylvania → Look up another NPI →
Also registered at 51 N 39TH St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Soo Abboud, MDOtolaryngology Physician1821033440
- Maureen Acker, CRNARegistered Nurse1740202696
- Nancy Acri, CRNACertified Registered Nurse Anesthetist1891072872
- Kelly Agnew, PA-CMedical Physician Assistant1619169281
- Adekemi Akano, M.D.Anesthesiology Physician1972950178
- Lama Al-Aswad, M.D.Ophthalmology Physician1336174937
Verify Mary Mahler in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersPennsylvania Department of State (PALS)
Search for license MD475737Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
The practice group's MIPS final score for 2023 (Medicare payment program): 85.5 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Mary Mahler among 265 medical oncology physician records in Pennsylvania
Mary Mahler, MD is one of 265 medical oncology physician records with a practice address in Pennsylvania. 83% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2021, is newer than 98% of them.
- NPI issued2021 · 98% of these records are older, 2% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileNo · 71% of these records are
- Record last updated2021 · 68% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RX0202X and a Pennsylvania practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Medical Oncology Physician providers in Pennsylvania
There are 265 medical oncology physician records in Pennsylvania.
All 265 in Pennsylvania → Every provider in Philadelphia → Medical Oncology Physician nationwide →
The 8 medical oncology physician records with the nearest ZIP codes
- Ravi Amaravadi, MDPhiladelphia, PA 191041043252455
- Charalambos Andreadis, MDPhiladelphia, PA 191041205877669
- Naomi Balzer, MDPhiladelphia, PA 191041477516888
- Adam Cohen, MDPhiladelphia, PA 191041245201029
- Susan Domchek, MDPhiladelphia, PA 191041487695102
- Kevin Fox, MDPhiladelphia, PA 191041578506887
- John Glick, MDPhiladelphia, PA 191041285677591
- Carl June, MDPhiladelphia, PA 191041386687689
Common questions
What is Mary Mahler, MD's NPI number?
Mary Mahler, MD's National Provider Identifier (NPI) is 1326703927, issued on Nov 8, 2021. An NPI identifies a provider in billing; it is not a license.
Where is Mary Mahler, MD located?
The NPPES record lists a practice address at 51 N 39TH St, Philadelphia, PA, 19104. Phone: (215) 662-9801. Providers update this record themselves, so call before visiting.
How can I verify Mary Mahler, MD's license?
NPPES lists Pennsylvania license number MD475737, as entered by the provider. 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.
What is Mary Mahler, MD's MIPS final score?
The 2023 MIPS final score is 85.5 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
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.