Mark Lawrence Chapman, M.D.
Gastroenterology Physician · New York, NY
Mark Lawrence Chapman, M.D. is a gastroenterology physician with a practice address in New York, New York, and NPI 1649294661, issued on Jul 26, 2006. Check the license (New York O88193-1, as entered in NPPES) on the NYS Education Department, Office of the Professions; the Medicare figures below come from public CMS files.
- Name
- Mark Lawrence Chapman
- Credential
- M.D.
- Primary taxonomy
- Gastroenterology Physician 207RG0100X
- License number
- O88193-1 NY
Self-reported in NPPES; status is on the state search - Practice location
- 12 E 86TH St, New York, NY 10028
- Phone
- (212) 861-2000
- Enumerated
- Jul 26, 2006
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Fax
- (212) 628-3648
- Medicaid ID
- 01355224 NY
- Entity
- Type 1 · individual
8 nearest gastroenterology physician records → All 1,797 in New York → Look up another NPI →
Also registered at 12 E 86TH St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Mark Lawrence Chapman in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersNYS Education Department, Office of the Professions
Search for license O88193-1Check 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 gastroenterology physician in 2024
31 Medicare Part D claims for 17 beneficiaries, against an average of 811 among the 16,445 providers of this specialty who prescribed in Part D. Brand-name drugs were 35% of 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.
Mark Lawrence Chapman among 1,797 gastroenterology physician records in New York
Mark Lawrence Chapman, M.D. is one of 1,797 gastroenterology physician records with a practice address in New York. 88% 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 15% of them.
- NPI issued2006 · 15% of these records are older, 44% newer
- In a Medicare fileYes · 88% of these records are
- In the CMS Doctors and Clinicians fileNo · 77% of these records are
- Record last updated2007 · 65% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RG0100X and a New York practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Gastroenterology Physician providers in New York
There are 1,797 gastroenterology physician records in New York.
All 1,797 in New York → Every provider in New York → Gastroenterology Physician nationwide →
The 8 gastroenterology physician records with the nearest ZIP codes
- David Berman, M.D.New York, NY 100281962442517
- Anthony Borcich, M.D.New York, NY 100281164599627
- Peter Chang, M.D.New York, NY 100281619995610
- Peter Distler, MDNew York, NY 100281548231160
- Leon Kavaler, MDNew York, NY 100281720015837
- Shawn Khodadadian, M.D.New York, NY 100281952505018
- Elena Nascimbeni Ferran, MDNew York, NY 100281578603213
- Joseph Nash, M.D.New York, NY 100281205808532
Common questions
What is Mark Lawrence Chapman, M.D.'s NPI number?
Mark Lawrence Chapman, M.D.'s National Provider Identifier (NPI) is 1649294661, issued on Jul 26, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Mark Lawrence Chapman, M.D. located?
The NPPES record lists a practice address at 12 E 86TH St, New York, NY, 10028. Phone: (212) 861-2000. Providers update this record themselves, so call before visiting.
How can I verify Mark Lawrence Chapman, M.D.'s license?
NPPES lists New York license number O88193-1, as entered by the provider. Search the NYS Education Department, Office of the Professions at https://www.op.nysed.gov/services/verifications/online-verification-searches. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Mark Lawrence Chapman, M.D. prescribe under Medicare Part D?
In 2024, Mark Lawrence Chapman, M.D. had 31 Medicare Part D claims for 17 beneficiaries; the average among gastroenterology physician prescribers was 811. Part D covers Medicare prescriptions only.
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.