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John Harmon, M.D.
NPI 1356391494 · Surgery Physician · Baltimore, MD
John Harmon, M.D. is a Surgery Physician provider in Baltimore, MD (NPI 1356391494).
Provider details
- NPI number
- 1356391494
- Entity type
- Individual
- Primary specialty
- Surgery PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- D51080 (MD)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
Detailed profile(95/100 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
2 documented practice locations
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
600 N Wolfe St
Baltimore, MD 21287-0005
Phone: (410) 955-9441
Street-level locationGet directions
Mailing address
6201 Greenleigh Ave
Middle River, MD 21220-2004
Additional practice locations (1)
- 4940 Eastern AveBaltimore, MD 21224-2735Phone: (410) 550-0400
Registry dates
- Enumerated
- 2006-05-11
- Last updated
- 2022-08-16
- Certified
- 2022-08-16
Frequently asked questions
- What is John Harmon's NPI number?
- John Harmon's National Provider Identifier (NPI) is 1356391494, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is John Harmon's specialty?
- John Harmon is listed in the NPPES registry with a primary specialty of Surgery Physician (Allopathic & Osteopathic Physicians).
- Where is John Harmon located?
- John Harmon's practice location on file with NPPES is 600 N Wolfe St, Baltimore, MD 21287-0005.
- What is John Harmon's phone number?
- The practice phone number listed in the NPPES registry for John Harmon is (410) 955-9441.
- Is John Harmon's NPI active?
- Yes — John Harmon's NPI (1356391494) is active in the NPPES registry as of the last update on 2022-08-16.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.