DR. MARCELLA DONOVAN WALKER M.D.
NPI 1003989211
Internal Medicine - Endocrinology, Diabetes & Metabolism in New York, NY
About Dr. Marcella Donovan Walker M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. MARCELLA DONOVAN WALKER M.D. (NPI 1003989211) is an individual endocrinology, diabetes & metabolism provider in New York, New York, licensed in New York (223814) and active in the NPI registry since November 2006. She is enrolled in Medicare PECOS, is affiliated with New York-presbyterian Hospital, and is a graduate of Johns Hopkins University School Of Medicine (1999).
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 3
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Dr. Marcella Donovan Walker M.d. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignments
2Medicare enrollment records show Marcella Walker reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
New York, NY 10032
- Reassigned Medicare billing, New York enrollment
- 612 clinicians in this Medicare group
New York, NY 10032
- Reassigned Medicare billing, New York enrollment
- Also billed through NPI 1982993184 (New York)
- 3,922 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Areas of Expertise CMS Part B claims 5
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Hospital Affiliations CMS Care Compare
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
New York-Presbyterian Hospital
Acute Care Hospitals · New York, NYPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 10032 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
Reported Quality Measures
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.
NEW YORK, NY 10032
NEW YORK, NY 10032
NEW YORK, NY 10032
NEW YORK, NY 10032
NEW YORK, NY 10032
NEW YORK, NY 10032
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 Marcella Walker's NPI number?
The NPI number for Marcella Walker is 1003989211. It was assigned to this individual provider in the NPPES registry on November 16, 2006.
Where is Marcella Walker located?
Marcella Walker practices at 180 Fort Washington Ave, New York, NY 10032. The listed phone number is (212) 342-1521.
What is Marcella Walker's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Endocrinology, Diabetes & Metabolism, with taxonomy code 207RE0101X.
Is Marcella Walker enrolled in Medicare?
Yes. Marcella Walker is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organizations bill Medicare for Marcella Walker's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Marcella Walker reassigns Medicare benefits to 2 organizations: Trustees Of Columbia University In The City Of New York (New York, NY) and Trustees Of Columbia University In The City Of New York (New York, NY). Each 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 Marcella Walker's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is Marcella Walker affiliated with any hospitals?
According to CMS data, Marcella Walker is affiliated with New York-Presbyterian Hospital.
When was this NPI record last updated?
The NPPES record for Marcella Walker 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.
# Dr. Marcella Donovan Walker, M.D. · NPI 1003989211
Endocrinology, Diabetes & Metabolism physician in New York, New York. Individual provider, active in the CMS NPPES registry since November 16, 2006.
## Identity
- **NPI:** 1003989211 (Entity type: Individual)
- **Enumerated:** November 16, 2006
- **Primary specialty:** Internal Medicine - Endocrinology, Diabetes & Metabolism · taxonomy 207RE0101X
- **State license:** 223814 (New York)
- **Sole proprietor:** No
## Practice location
- **Address:** 180 FORT WASHINGTON AVE, New York, NY 10032-3735
- **Phone:** (212) 342-1521
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 2 organizations under Medicare reassignment (form CMS-855R): Trustees Of Columbia University In The City Of New York (NPI 1437176047, New York, NY); Trustees Of Columbia University In The City Of New York (NPI 1477068971, New York, NY) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Johns Hopkins University School Of Medicine, class of 1999
## Record status
- **NPPES last updated:** July 8, 2007
- **Other identifiers:** Medicare UPIN I28936 (NY); Medicare ID-Type Unspecified 3X5931 (NY); Medicaid 02641069 (NY)
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Source: [NPI Profile](https://npiprofile.com/npi/1003989211) · Data from the CMS NPPES public registry.