William Whalen, DNP
NPI 1285433961 · Family Nurse Practitioner · Washington, DC
Enrolled with Medicare as Practitioner - Nurse Practitioner · source: CMS PECOS Public Provider Enrollment (2026.04.01)
William Whalen, DNP is a Family Nurse Practitioner provider in Washington, DC (NPI 1285433961).
Provider details
- NPI number
- 1285433961
- Entity type
- Individual
- Primary specialty
- Family Nurse PractitionerPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- DNP
- Sex
- Male
- Sole proprietor
- No
- License
- AC007318 (MD)
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
Physician Assistants & Advanced Practice Nursing Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
1 yr in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
3 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 (2)
- 5215 Loughboro Rd NwWashington, DC 20016-2618Phone: (202) 660-5182Fax: (202) 660-7081
- 8600 Old Georgetown RdBethesda, MD 20814-1422Phone: (301) 896-7500
Registry dates
- Enumerated
- 2025-03-13
- Last updated
- 2025-06-11
- Certified
- 2025-06-11
Frequently asked questions
- What is William Whalen's NPI number?
- William Whalen's National Provider Identifier (NPI) is 1285433961, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Whalen's specialty?
- William Whalen is listed in the NPPES registry with a primary specialty of Family Nurse Practitioner (Physician Assistants & Advanced Practice Nursing Providers).
- Where is William Whalen located?
- William Whalen's practice location on file with NPPES is 5255 Loughboro Rd Nw, Washington, DC 20016-2696.
- What is William Whalen's phone number?
- The practice phone number listed in the NPPES registry for William Whalen is (202) 660-5182.
- Does William Whalen accept Medicare?
- William Whalen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is William Whalen's NPI active?
- Yes — William Whalen's NPI (1285433961) is active in the NPPES registry as of the last update on 2025-06-11.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.