Gregory Callahan, BOCO
NPI 1497944946 · Other Technician · Baltimore, MD
Gregory Callahan, BOCO is a Other Technician provider in Baltimore, MD (NPI 1497944946).
Provider details
- NPI number
- 1497944946
- Entity type
- Individual
- Primary specialty
- Other TechnicianTechnologists, Technicians & Other Technical Service Providers
- Credential
- BOCO
- Sex
- Male
- Sole proprietor
- No
- License
- C21679 (MD)
Specialties & taxonomies
Technologists, Technicians & Other Technical Service Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
18 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
- 2007-10-22
- Last updated
- 2007-10-22
Frequently asked questions
- What is Gregory Callahan's NPI number?
- Gregory Callahan's National Provider Identifier (NPI) is 1497944946, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Gregory Callahan's specialty?
- Gregory Callahan is listed in the NPPES registry with a primary specialty of Other Technician (Technologists, Technicians & Other Technical Service Providers).
- Where is Gregory Callahan located?
- Gregory Callahan's practice location on file with NPPES is 3900 Loch Raven Blvd, Baltimore, MD 21218-2108.
- What is Gregory Callahan's phone number?
- The practice phone number listed in the NPPES registry for Gregory Callahan is (410) 605-7000.
- Is Gregory Callahan's NPI active?
- Yes — Gregory Callahan's NPI (1497944946) is active in the NPPES registry as of the last update on 2007-10-22.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.