IndividualActive
Mark Callahan, MD
NPI 1194803890 · Internal Medicine Physician · New York, NY
Mark Callahan, MD is a Internal Medicine Physician provider in New York, NY (NPI 1194803890).
Provider details
- NPI number
- 1194803890
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 197116 (NY)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
Detailed profile(90/100 index)
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
19 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
17 E 102nd St
New York, NY 10029-5204
Phone: (212) 241-6585
Fax: (212) 824-2335
Street-level locationGet directions
Mailing address
1 Gustave L Levy Pl
New York, NY 10029-6500
Registry dates
- Enumerated
- 2006-11-01
- Last updated
- 2012-01-24
Frequently asked questions
- What is Mark Callahan's NPI number?
- Mark Callahan's National Provider Identifier (NPI) is 1194803890, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Callahan's specialty?
- Mark Callahan is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Callahan located?
- Mark Callahan's practice location on file with NPPES is 17 E 102nd St, New York, NY 10029-5204.
- What is Mark Callahan's phone number?
- The practice phone number listed in the NPPES registry for Mark Callahan is (212) 241-6585.
- Is Mark Callahan's NPI active?
- Yes — Mark Callahan's NPI (1194803890) is active in the NPPES registry as of the last update on 2012-01-24.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.