Quick answers
- Does Geema S. Masson accept Medicare assignment?
- Yes. Medicare's clinician data says Geema S. Masson accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does Geema S. Masson see?
- In 2024, CMS data shows 294 Original Medicare patients and 306 services for Geema S. Masson. This counts Original Medicare only and measures volume, not quality.
- What is Geema S. Masson's NPI number?
- 1649368432. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Geema S. Masson, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 294 |
|---|---|
| Services billed to Medicare | 306 |
| Different services or procedures | 31 |
| Participating Medicare provider | Yes |
| Average age of these patients | 73 |
Most frequent services
- Anesthesia for other procedure on skin of arms, legs, and front body (00400)128 services
- Anesthesia for reconstruction of breast (00402)37 services
- Anesthesia for procedure on nerves, muscles, tendons, fascia, and bursae of shoulder and underarm (01610)32 services
- Anesthesia for other procedure on skin, muscles, or nerves of head, neck, and upper back (00300)21 services
- Anesthesia for extensive removal of prostate (00865)15 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- High cholesterol75%
- Cancer (breast, colorectal, lung, prostate, endometrial or leukemia/lymphoma)75%
- High blood pressure66%
- Arthritis46%
- Anxiety31%
- Diabetes25%
Practice locations
Addresses where Geema S. Masson is enrolled with Medicare (CMS data updated October 2, 2026).
- 1133 York AveNew York, NY 10065 (646) 888‑7100
- 1275 York AveNew York, NY 10065 (212) 639‑2000
Group practices
Medicare enrollment lists Geema S. Masson as a member of this group (CMS data updated October 2, 2026).
- Memorial Anesthesiology Group302 clinicians in the group
Specialties
- Anesthesiologyprimary
Other anesthesiologists in New York
Clinicians with the same Medicare primary specialty in New York, NY — not a recommendation.
Other clinicians in Memorial Anesthesiology Group
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2002 (24 years since medical school) |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1649368432 |
| 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
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- 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