Mark Chapman, M.D.
NPI 1649294661 · Gastroenterology Physician · New York, NY
Enrolled with Medicare as Practitioner - Gastroenterology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Chapman, M.D. is a Gastroenterology Physician provider in New York, NY (NPI 1649294661).
Provider details
- NPI number
- 1649294661
- Entity type
- Individual
- Primary specialty
- Gastroenterology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- O88193-1 (NY)
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.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-07-26
- Last updated
- 2007-07-08
Frequently asked questions
- What is Mark Chapman's NPI number?
- Mark Chapman's National Provider Identifier (NPI) is 1649294661, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Chapman's specialty?
- Mark Chapman is listed in the NPPES registry with a primary specialty of Gastroenterology Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Chapman located?
- Mark Chapman's practice location on file with NPPES is 12 E 86th St, New York, NY 10028-0506.
- What is Mark Chapman's phone number?
- The practice phone number listed in the NPPES registry for Mark Chapman is (212) 861-2000.
- Does Mark Chapman accept Medicare?
- Mark Chapman is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Chapman's NPI active?
- Yes — Mark Chapman's NPI (1649294661) is active in the NPPES registry as of the last update on 2007-07-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.