Mara Horwitz
Specialist · Pittsburgh, PA
Mara Horwitz is a specialist with a practice address in Pittsburgh, Pennsylvania, and NPI 1275507691, issued on Feb 14, 2006. Check the license (Pennsylvania MD044459E, as entered in NPPES) with the Pennsylvania board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Mara Horwitz
- Primary taxonomy
- Specialist 174400000X
- License number
- MD044459E PA
Self-reported in NPPES; status is on the state search - Practice location
- 3601 5TH Ave, Pittsburgh, PA 15213
- Phone
- (412) 648-9577
- Enumerated
- Feb 14, 2006
- Record last updated
- Mar 25, 2021 (not updated in 5 years: call before relying on the address or phone)
- Entity
- Type 1 · individual
8 nearest specialist records → All 2,031 in Pennsylvania → Look up another NPI →
Also registered at 3601 5TH Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Rima Abdel MassihInternal Medicine Physician1003079914
- Christina Abriola, R.D.Registered Dietitian1356647507
- Susan Adamczyk, RDRegistered Dietitian1831524263
- Rohit Aggarwal, M.D.Rheumatology Physician1538340138
- Haruko Akatsu, MDSpecialist1922072370
- Charles Atwood, MDPulmonary Disease Physician1508838905
Verify Mara Horwitz in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Pennsylvania board licenses this profession
Search for license MD044459ECheck the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
96% fewer Medicare Part D claims than the average specialist in 2024
54 Medicare Part D claims for 22 beneficiaries, against an average of 1,380 among the 8,233 providers of this specialty who prescribed in Part D. Brand-name drugs were 39% of claims.
Most prescribed
- Alendronate Sodium20 claims
- Synthroid14 claims
- Levothyroxine Sodium13 claims
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.
The practice group's MIPS final score for 2023 (Medicare payment program): 77.5 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).
Mara Horwitz among 2,031 specialist records in Pennsylvania
Mara Horwitz is one of 2,031 specialist records with a practice address in Pennsylvania. 40% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 9% of them.
- NPI issued2006 · 9% of these records are older, 34% newer
- In a Medicare fileYes · 40% of these records are
- In the CMS Doctors and Clinicians fileNo · 27% of these records are
- Record last updated2021 · 69% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 174400000X and a Pennsylvania practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
767 specialist records list a practice address in Pittsburgh
They are 767 of the 28,866 NPPES records with a practice address in Pittsburgh, and 2,031 specialist records in Pennsylvania.
All 2,031 in Pennsylvania → Every provider in Pittsburgh → Specialist nationwide →
The 8 specialist records with the nearest ZIP codes
- Raed Abdullah, MDPittsburgh, PA 152131962474353
- Howard Aizenstein, MDPittsburgh, PA 152131447222898
- Ali Al-Khafaji, MDPittsburgh, PA 152131992776348
- Louis AlarconPittsburgh, PA 152131306817705
- Cuneyt Alper, MDPittsburgh, PA 152131427029826
- Gulay AlperPittsburgh, PA 152131972575132
- Nikhil AmesurPittsburgh, PA 152131760453179
- Rajesh AnejaPittsburgh, PA 152131780656173
Common questions
What is Mara Horwitz's NPI number?
Mara Horwitz's National Provider Identifier (NPI) is 1275507691, issued on Feb 14, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Mara Horwitz located?
The NPPES record lists a practice address at 3601 5TH Ave, Pittsburgh, PA, 15213. Phone: (412) 648-9577. Providers update this record themselves, so call before visiting.
How can I verify Mara Horwitz's license?
NPPES lists Pennsylvania license number MD044459E, as entered by the provider. Search the Pennsylvania board that licenses this profession; the NPPES record confirms identity only.
How much does Mara Horwitz prescribe under Medicare Part D?
In 2024, Mara Horwitz had 54 Medicare Part D claims for 22 beneficiaries; the average among specialist prescribers was 1,380. Part D covers Medicare prescriptions only.
What is Mara Horwitz's MIPS final score?
The 2023 MIPS final score is 77.5 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.