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DR. MARK LAWRENCE CHAPMAN M.D.
NPI 1649294661
Internal Medicine - Gastroenterology in New York, NY

Active since July 26, 2006PECOS Enrolled
12 E 86TH ST, NEW YORK, NY 10028(212) 861-2000(212) 628-3648 Get Directions Write a Review

NPPES record last updated: July 8, 2007. Verified against the NPPES registry weekly; last sync: October 18, 2026.

About Dr. Mark Lawrence Chapman M.d. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. MARK LAWRENCE CHAPMAN M.D. (NPI 1649294661) is an individual gastroenterology provider in New York, New York, licensed in New York (O88193-1) and active in the NPI registry since July 2006. He is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1649294661
Entity TypeIndividualMale
Primary Taxonomy207RG0100X
Provider Legal NameDR. MARK LAWRENCE CHAPMANCredential: M.D.
Location Address12 E 86TH STNew York, NY 10028-0506
Mailing Address21 Ridge RdNorwood, NJ 07648-2412 · (201) 767-3555 · Fax (201) 767-3309
Phone(212) 861-2000
Fax(212) 628-3648
Sole ProprietorYes
Enumeration DateJuly 26, 2006
Last NPPES UpdateJuly 8, 2007
✔ NPI 1649294661 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal Medicine · GastroenterologyAllopathic & Osteopathic Physicians
Taxonomy Code207RG0100X
License✔ Licensed in NY · O88193-1
Definition
An internist who specializes in diagnosis and treatment of diseases of the digestive organs including the stomach, bowels, liver and gallbladder. This specialist treats conditions such as abdominal pain, ulcers, diarrhea, cancer and jaundice and performs complex diagnostic and therapeutic procedures using endoscopes to visualize internal organs.
12 E 86TH ST, New York, NY 10028
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Other Identifiers 3

Medicaid01355224NY
Medicare UPINB79812NY
Medicare ID-Type Unspecified907861NY

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Dr. Mark Lawrence Chapman M.d. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignment

Medicare enrollment records show Mark Chapman reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Icahn School Of Medicine At Mount Sinai
0.7 mi
Gastroenterology
1 GUSTAVE L LEVY PL
New York, NY 10029
  • Reassigned Medicare billing, New York enrollment
  • 104 clinicians in this Medicare group
NPI 1730440777 (212) 987-3100

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 10028 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$150.24 typical visit price
range $65.69 – $198.19
Typical copayment $37.56 (range $16.42 – $49.54)
Most-billed visit code 99204
Established Patient
$114.88 typical visit price
range $21.20 – $160.66
Typical copayment $28.72 (range $5.30 – $40.16)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

MRS. CONSTANCE COTTER WEISENSEEL MSW
Marriage & Family Therapist
12 E 86TH ST, # 1124
NEW YORK, NY 10028
New York County (212) 396-3597
EUGENE FINE M.D., IRWIN LEVENTHAL M.D.
Urology
12 E 86TH ST
NEW YORK, NY 10028
New York County (212) 517-9555
PREMIER PHYSICIANS OF NEW YORK PLLC
Urology
12 E 86TH ST
NEW YORK, NY 10028
New York County (212) 517-9555
DR. ILONA MIRECKI M.D.
Psychiatry & Neurology (Psychiatry)
12 E 86TH ST, SUITE1201
NEW YORK, NY 10028
New York County (917) 273-4411
DR. IRWIN LEVENTHAL MD
Urology
12 E 86TH ST
NEW YORK, NY 10028
New York County (212) 517-9555
DR. PAUL SCHIENBERG PH.D.
Psychologist
12 E 86TH ST, 929
NEW YORK, NY 10028
New York County (212) 879-5709
DR. EARLE A LOCKHART M.D
Pediatrics (Pediatric Nephrology)
12 E 86TH ST, #1031
NEW YORK, NY 10028
New York County (201) 401-4352
DR. FERNANDO M. CLEMENTE M.D.
Specialist
12 E 86TH ST, APT. 908
NEW YORK, NY 10028
New York County (212) 535-2675

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Mark Chapman's NPI number?

The NPI number for Mark Chapman is 1649294661. It was assigned to this individual provider in the NPPES registry on July 26, 2006.

Where is Mark Chapman located?

Mark Chapman practices at 12 E 86th St, New York, NY 10028. The listed phone number is (212) 861-2000.

What is Mark Chapman's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Gastroenterology, with taxonomy code 207RG0100X.

Is Mark Chapman enrolled in Medicare?

Yes. Mark Chapman is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for Mark Chapman's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Mark Chapman reassigns Medicare benefits to Icahn School Of Medicine At Mount Sinai (New York, NY). The reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Mark Chapman's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

When was this NPI record last updated?

The NPPES record for Mark Chapman was last updated on July 8, 2007. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 19 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.