Charles Callahan, DO
NPI 1295823557 · Pediatric Pulmonology Physician · Washington, DC
Enrolled with Medicare as Practitioner - Pulmonary Disease · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Charles Callahan, DO is a Pediatric Pulmonology Physician provider in Washington, DC (NPI 1295823557).
Provider details
- NPI number
- 1295823557
- Entity type
- Individual
- Primary specialty
- Pediatric Pulmonology PhysicianAllopathic & Osteopathic Physicians
- Credential
- DO
- Sex
- Male
- Sole proprietor
- Yes
- License
- DOS719 (HI)
Specialties & taxonomies
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
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
Mailing address
Additional practice locations (1)
- 22 S Greene StBaltimore, MD 21201-1544Phone: (667) 214-1916Fax: (410) 225-9405
Registry dates
- Enumerated
- 2006-10-11
- Last updated
- 2023-10-11
- Certified
- 2023-10-11
Frequently asked questions
- What is Charles Callahan's NPI number?
- Charles Callahan's National Provider Identifier (NPI) is 1295823557, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Charles Callahan's specialty?
- Charles Callahan is listed in the NPPES registry with a primary specialty of Pediatric Pulmonology Physician (Allopathic & Osteopathic Physicians).
- Where is Charles Callahan located?
- Charles Callahan's practice location on file with NPPES is Walter Reed Army Medical Center, Washington, DC 20907-1234.
- What is Charles Callahan's phone number?
- The practice phone number listed in the NPPES registry for Charles Callahan is (202) 782-8397.
- Does Charles Callahan accept Medicare?
- Charles Callahan is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Charles Callahan's NPI active?
- Yes — Charles Callahan's NPI (1295823557) is active in the NPPES registry as of the last update on 2023-10-11.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.