Mara Horwitz
NPI 1275507691 · Specialist · Pittsburgh, PA
Enrolled with Medicare as Practitioner - Endocrinology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mara Horwitz is a Specialist provider in Pittsburgh, PA (NPI 1275507691).
Provider details
- NPI number
- 1275507691
- Entity type
- Individual
- Primary specialty
- SpecialistOther Service Providers
- Sex
- Female
- Sole proprietor
- No
- License
- MD044459E (PA)
Specialties & taxonomies
Other Service Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
20 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 3 distinct drugs on file.
| Drug | Part D claims (2024) |
|---|---|
| Alendronate Sodium | 20 |
| Levothyroxine Sodiumbrand: Synthroid | 14 |
| Levothyroxine Sodium | 13 |
Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they do notinclude cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means no Part D record, never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-02-14
- Last updated
- 2021-03-25
Frequently asked questions
- What is Mara Horwitz's NPI number?
- Mara Horwitz's National Provider Identifier (NPI) is 1275507691, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mara Horwitz's specialty?
- Mara Horwitz is listed in the NPPES registry with a primary specialty of Specialist (Other Service Providers).
- Where is Mara Horwitz located?
- Mara Horwitz's practice location on file with NPPES is 3601 5th Ave, Pittsburgh, PA 15213-3403.
- What is Mara Horwitz's phone number?
- The practice phone number listed in the NPPES registry for Mara Horwitz is (412) 648-9577.
- Does Mara Horwitz accept Medicare?
- Mara Horwitz is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mara Horwitz's NPI active?
- Yes — Mara Horwitz's NPI (1275507691) is active in the NPPES registry as of the last update on 2021-03-25.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.