Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.

Dr. Charles Willis Callahan, DO

Individual provider Pediatric Pulmonology Physician · NPI 1295823557

Dr. Charles Willis Callahan, DO is a Pediatric Pulmonology Physician in Washington, District of Columbia. Practices as a sole proprietor and works from 2 locations. Licensed in Hawaii.

Licensed in
HI
In the registry since
2006
What do these letters mean?
DO — Doctor of Osteopathic Medicine
A fully licensed physician, trained like an MD with additional musculoskeletal training. Equivalent practice rights in all 50 states.

See every abbreviation used in this directory →

Practice location Address may be wrong

The ZIP code does not match the city and state on this record. Call before visiting.

Walter Reed Army Medical Ctr
Washington, DC 20907-1234
Phone: (202) 782-8397
Fax: (202) 782-4914
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 22 S Greene St, Baltimore, MD 21201-1544 — (667) 214-1916

Specialties & licences

Pediatric Pulmonology Physician (primary) Taxonomy 2080P0214X · Licence DOS719 (HI)

Record details

NPI number1295823557
Entity typeIndividual (Type 1)
GenderMale
Credentials DO
Sole proprietorYes
NPI enumeratedOctober 11, 2006
Last updated in NPPESOctober 11, 2023
Certification dateOctober 11, 2023

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