John Greely, M.D.
NPI 1922091842 · Hospitalist Physician · New York, NY
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
John Greely, M.D. is a Hospitalist Physician provider in New York, NY (NPI 1922091842).
Provider details
- NPI number
- 1922091842
- Entity type
- Individual
- Primary specialty
- Hospitalist PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 200383 (NY)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
20 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
4 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
618 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 264 | $129 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 213 | $86 |
| Hospital Discharge Day Management, More Than 30 Minutes99239 | 60 | $125 |
| Initial Hospital Care With Moderate Level of Medical Decision Making, If Using Time, at Least 75 Minutes99223 | 47 | $189 |
| Hospital Discharge Day Management, 30 Minutes Or Less99238 | 21 | $89 |
| Initial Hospital Care With Straightforward Or Low-Level Medical Decision Making, If Using Time, at Least 55 Minutes99222 | 13 |
Practice location
Mailing address
Additional practice locations (3)
- 1000 10th AveNew York, NY 10019-1147Phone: (212) 523-4000
- 1111 Amsterdam AveNew York, NY 10025-1716Phone: (212) 523-4000
- 2771 Frederick Douglass BlvdNew York, NY 10039-3027Phone: (212) 690-0303
Registry dates
- Enumerated
- 2005-08-25
- Last updated
- 2021-05-25
- Certified
- 2021-05-25
Frequently asked questions
- What is John Greely's NPI number?
- John Greely's National Provider Identifier (NPI) is 1922091842, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is John Greely's specialty?
- John Greely is listed in the NPPES registry with a primary specialty of Hospitalist Physician (Allopathic & Osteopathic Physicians).
- Where is John Greely located?
- John Greely's practice location on file with NPPES is 1090 Amsterdam Ave, New York, NY 10025-1737.
- What is John Greely's phone number?
- The practice phone number listed in the NPPES registry for John Greely is (212) 961-5500.
- Does John Greely accept Medicare?
- John Greely is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is John Greely's NPI active?
- Yes — John Greely's NPI (1922091842) is active in the NPPES registry as of the last update on 2021-05-25.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.