What is Callahan Allen's NPI number?

Callahan Allen's National Provider Identifier (NPI) is 1851240543, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.

What is Callahan Allen's specialty?

Callahan Allen is listed in the NPPES registry with a primary specialty of Physician Assistant (Physician Assistants & Advanced Practice Nursing Providers).

Where is Callahan Allen located?

Callahan Allen's practice location on file with NPPES is 900 S Caton Ave, Baltimore, MD 21229-5201.

What is Callahan Allen's phone number?

The practice phone number listed in the NPPES registry for Callahan Allen is (667) 234-6000.

Is Callahan Allen's NPI active?

Yes — Callahan Allen's NPI (1851240543) is active in the NPPES registry as of the last update on 2026-01-26.

IndividualActive

Callahan Allen, PA-C

NPI 1851240543 · Physician Assistant · Baltimore, MD

Callahan Allen, PA-C is a Physician Assistant provider in Baltimore, MD (NPI 1851240543).

Provider details

NPI number: 1851240543
Entity type: Individual
Primary specialty: Physician AssistantPhysician Assistants & Advanced Practice Nursing Providers
Credential: PA-C
Sex: Female
Sole proprietor: Yes

Specialties & taxonomies

Physician AssistantPrimary363A00000X
Physician Assistants & Advanced Practice Nursing Providers

Profile Score

Basic profile(47/100 index)

A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.

Registry tenure38% of score
Under 1 yr in registry
Profile completeness38% of score
83% 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

900 S Caton Ave

Baltimore, MD 21229-5201

Phone: (667) 234-6000

Street-level locationGet directions

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Mailing address