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John Papanastassiou, M.D.
NPI 1821244336 · Specialist · New York, NY
John Papanastassiou, M.D. is a Specialist provider in New York, NY (NPI 1821244336).
Provider details
- NPI number
- 1821244336
- Entity type
- Individual
- Primary specialty
- SpecialistOther Service Providers
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
Specialties & taxonomies
Other Service Providers
Profile Score
Detailed profile(80/100 index)
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
17 yrs in NPPES registry
- Profile completeness38% of score
83% 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
1275 York Avenue
New York, NY 10021
Phone: (212) 639-7610
Street-level locationGet directions
Mailing address
303 E 60th St
New York, NY 10022-1514
Registry dates
- Enumerated
- 2008-08-15
- Last updated
- 2008-08-15
Frequently asked questions
- What is John Papanastassiou's NPI number?
- John Papanastassiou's National Provider Identifier (NPI) is 1821244336, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is John Papanastassiou's specialty?
- John Papanastassiou is listed in the NPPES registry with a primary specialty of Specialist (Other Service Providers).
- Where is John Papanastassiou located?
- John Papanastassiou's practice location on file with NPPES is 1275 York Avenue, New York, NY 10021.
- What is John Papanastassiou's phone number?
- The practice phone number listed in the NPPES registry for John Papanastassiou is (212) 639-7610.
- Is John Papanastassiou's NPI active?
- Yes — John Papanastassiou's NPI (1821244336) is active in the NPPES registry as of the last update on 2008-08-15.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.