John Kark, M.D.
NPI 1538241625 · Hematology & Oncology Physician · Philadelphia, PA
John Kark, M.D. is a Hematology & Oncology Physician provider in Philadelphia, PA (NPI 1538241625).
Provider details
- NPI number
- 1538241625
- Entity type
- Individual
- Primary specialty
- Hematology & Oncology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- D0016436 (MD)
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
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
Mailing address
Registry dates
- Enumerated
- 2006-10-19
- Last updated
- 2026-05-31
Frequently asked questions
- What is John Kark's NPI number?
- John Kark's National Provider Identifier (NPI) is 1538241625, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is John Kark's specialty?
- John Kark is listed in the NPPES registry with a primary specialty of Hematology & Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is John Kark located?
- John Kark's practice location on file with NPPES is 1015 Chestnut Street, Philadelphia, PA 19107-4310.
- What is John Kark's phone number?
- The practice phone number listed in the NPPES registry for John Kark is (215) 955-4730.
- Is John Kark's NPI active?
- Yes — John Kark's NPI (1538241625) is active in the NPPES registry as of the last update on 2026-05-31.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.