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John Warren, M.D.
NPI 1548202625 · Infectious Disease Physician · Baltimore, MD
John Warren, M.D. is a Infectious Disease Physician provider in Baltimore, MD (NPI 1548202625).
Provider details
- NPI number
- 1548202625
- Entity type
- Individual
- Primary specialty
- Infectious Disease PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- D21377 (MD)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
Detailed profile(91/100 index)
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
22 S Greene St
Baltimore, MD 21201-1544
Phone: (410) 706-4242
Fax: (410) 706-4200
Street-level locationGet directions
Mailing address
Po Box 64442
Baltimore, MD 21264-4442
Registry dates
- Enumerated
- 2006-06-12
- Last updated
- 2010-11-15
Frequently asked questions
- What is John Warren's NPI number?
- John Warren's National Provider Identifier (NPI) is 1548202625, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is John Warren's specialty?
- John Warren is listed in the NPPES registry with a primary specialty of Infectious Disease Physician (Allopathic & Osteopathic Physicians).
- Where is John Warren located?
- John Warren's practice location on file with NPPES is 22 S Greene St, Baltimore, MD 21201-1544.
- What is John Warren's phone number?
- The practice phone number listed in the NPPES registry for John Warren is (410) 706-4242.
- Is John Warren's NPI active?
- Yes — John Warren's NPI (1548202625) is active in the NPPES registry as of the last update on 2010-11-15.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.