Quick answers
- Which hospitals does Marcella D. Walker work at?
- Medicare's official clinician data lists Marcella D. Walker at 2 hospitals: Greenwich Hospital Association - and New York-Presbyterian Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Marcella D. Walker see patients?
- Medicare's clinician data lists 1 practice location in New York, NY. Call before your visit to confirm the address.
- What is Marcella D. Walker's specialty?
- Medicare lists Endocrinology as the primary specialty, and also Internal Medicine.
- Does Marcella D. Walker accept Medicare assignment?
- Yes. Medicare's clinician data says Marcella D. Walker accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- Does Marcella D. Walker offer telehealth?
- Medicare's clinician data says Marcella D. Walker offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for Marcella D. Walker?
- (212) 305-4931, as listed in official Medicare / NPI Registry data.
- What is Marcella D. Walker's NPI number?
- 1003989211. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Marcella D. Walker works
Medicare's Facility Affiliation Data lists Marcella D. Walker at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Greenwich Hospital Association -Greenwich, CT · Acute Care Hospital · CCN 070018
- New York-Presbyterian HospitalNew York, NY · Acute Care Hospital · CCN 330101
Practice locations
Addresses where Marcella D. Walker is enrolled with Medicare (CMS data updated 2026-10-02).
- 622 W 168th StNew York, NY 10032 (212) 305‑4931
Group practices
Medicare enrollment lists Marcella D. Walker as a member of this group (CMS data updated 2026-10-02).
- Trustees of Columbia University in the City of New York2,296 clinicians in the group
Specialties
- Endocrinologyprimary
- Internal Medicinealso
Other endocrinologists in New York
Clinicians with the same Medicare primary specialty in New York, NY — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Johns Hopkins University School Of Medicine |
| Graduation year | 1999 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1003989211 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated 2026-10-02, retrieved 2026-10-29
- National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians