Marshall Forstein, MD
NPI 1063555423 · Psychiatry Physician · Cambridge, MA
Enrolled with Medicare as Practitioner - Psychiatry · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Marshall Forstein, MD is a Psychiatry Physician provider in Cambridge, MA (NPI 1063555423).
Provider details
- NPI number
- 1063555423
- Entity type
- Individual
- Primary specialty
- Psychiatry PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 49162 (MA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
19 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 · 2 distinct drugs on file.
| Drug | Part D claims (2024) |
|---|---|
| Methylphenidate Hclbrand: Methylphenidate Er | 12 |
| Clonazepam | 12 |
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
- 2007-02-15
- Last updated
- 2012-02-14
Frequently asked questions
- What is Marshall Forstein's NPI number?
- Marshall Forstein's National Provider Identifier (NPI) is 1063555423, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Marshall Forstein's specialty?
- Marshall Forstein is listed in the NPPES registry with a primary specialty of Psychiatry Physician (Allopathic & Osteopathic Physicians).
- Where is Marshall Forstein located?
- Marshall Forstein's practice location on file with NPPES is 1493 Cambridge St, Cambridge, MA 02139-1047.
- What is Marshall Forstein's phone number?
- The practice phone number listed in the NPPES registry for Marshall Forstein is (617) 665-1189.
- Does Marshall Forstein accept Medicare?
- Marshall Forstein is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Marshall Forstein's NPI active?
- Yes — Marshall Forstein's NPI (1063555423) is active in the NPPES registry as of the last update on 2012-02-14.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.