Marcus Mermelstein, PA-C
NPI 1629463898 · Physician Assistant · Bethesda, MD
Enrolled with Medicare as Practitioner - Physician Assistant · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Marcus Mermelstein, PA-C is a Physician Assistant provider in Bethesda, MD (NPI 1629463898).
Provider details
- NPI number
- 1629463898
- Entity type
- Individual
- Primary specialty
- Physician AssistantPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- PA-C
- Sex
- Male
- Sole proprietor
- No
- License
- C0007408 (MD)
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
11 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.
Practice location
Mailing address
Registry dates
- Enumerated
- 2015-04-03
- Last updated
- 2025-05-06
- Certified
- 2025-05-06
Frequently asked questions
- What is Marcus Mermelstein's NPI number?
- Marcus Mermelstein's National Provider Identifier (NPI) is 1629463898, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Marcus Mermelstein's specialty?
- Marcus Mermelstein is listed in the NPPES registry with a primary specialty of Physician Assistant (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Marcus Mermelstein located?
- Marcus Mermelstein's practice location on file with NPPES is 8901 Wisconsin Ave Bldg 9a Fl 3, Surgical Icu, Bethesda, MD 20889-5367.
- What is Marcus Mermelstein's phone number?
- The practice phone number listed in the NPPES registry for Marcus Mermelstein is (301) 400-0018.
- Does Marcus Mermelstein accept Medicare?
- Marcus Mermelstein is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Marcus Mermelstein's NPI active?
- Yes — Marcus Mermelstein's NPI (1629463898) is active in the NPPES registry as of the last update on 2025-05-06.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.