John Ryan, M.D.
NPI 1821046095 · Infectious Disease Physician · New York, NY
John Ryan, M.D. is a Infectious Disease Physician provider in New York, NY (NPI 1821046095).
Provider details
- NPI number
- 1821046095
- Entity type
- Individual
- Primary specialty
- Infectious Disease PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- 82080 (MA)
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 tenure38% of score
20 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
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.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-05-04
- Last updated
- 2014-07-22
Frequently asked questions
- What is John Ryan's NPI number?
- John Ryan's National Provider Identifier (NPI) is 1821046095, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is John Ryan's specialty?
- John Ryan is listed in the NPPES registry with a primary specialty of Infectious Disease Physician (Allopathic & Osteopathic Physicians).
- Where is John Ryan located?
- John Ryan's practice location on file with NPPES is 450 E 29th St, New York, NY 10016-8367.
- What is John Ryan's phone number?
- The practice phone number listed in the NPPES registry for John Ryan is (212) 308-6000.
- Is John Ryan's NPI active?
- Yes — John Ryan's NPI (1821046095) is active in the NPPES registry as of the last update on 2014-07-22.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.