Quick answers
- Does William R. Jarnagin accept Medicare assignment?
- Yes. Medicare's clinician data says William R. Jarnagin 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 William R. Jarnagin see?
- In 2024, CMS data shows 219 Original Medicare patients and 485 services for William R. Jarnagin. This counts Original Medicare only and measures volume, not quality.
- What is William R. Jarnagin's NPI number?
- 1851373450. 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 William R. Jarnagin, 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 | 219 |
|---|---|
| Services billed to Medicare | 485 |
| Different services or procedures | 56 |
| Participating Medicare provider | Yes |
| Average age of these patients | 75 |
Most frequent services
- New patient office or other outpatient visit with a high level of medical decision making, if using time, 60 minutes or more (99205)80 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)64 services
- New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more (99204)56 services
- Ultrasonic guidance during surgery (76998)37 services
- Partial removal of pancreas, bile duct, and small bowel with connection of pancreas to small bowel (48150)34 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 blood pressure75%
- High cholesterol75%
- Arthritis50%
- Diabetes39%
- Ischemic heart disease38%
- Cancer (breast, colorectal, lung, prostate, endometrial or leukemia/lymphoma)38%
Practice locations
Addresses where William R. Jarnagin is enrolled with Medicare (CMS data updated October 2, 2026).
- 1275 York AveNew York, NY 10065 (212) 639‑2000
- 160 E 53rd StNew York, NY 10022 (212) 610‑0496
Group practices
Medicare enrollment lists William R. Jarnagin as a member of this group (CMS data updated October 2, 2026).
- MSKCC Surgery Group369 clinicians in the group
Specialties
- General Surgeryprimary
Other general surgeons in New York
Clinicians with the same Medicare primary specialty in New York, NY — not a recommendation.
Other clinicians in MSKCC Surgery Group
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 1988 (38 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1851373450 |
| 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