Diane Williams, PAC
NPI 1285609438 · Physician Assistant · Havre De Grace, MD
Enrolled with Medicare as Practitioner - Physician Assistant · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Diane Williams, PAC is a Physician Assistant provider in Havre De Grace, MD (NPI 1285609438).
Provider details
- NPI number
- 1285609438
- Entity type
- Individual
- Primary specialty
- Physician AssistantPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- PAC
- Sex
- Female
- Sole proprietor
- No
- License
- C0002014 (MD)
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
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
20 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
- 2006-02-21
- Last updated
- 2018-02-28
Frequently asked questions
- What is Diane Williams's NPI number?
- Diane Williams's National Provider Identifier (NPI) is 1285609438, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Diane Williams's specialty?
- Diane Williams is listed in the NPPES registry with a primary specialty of Physician Assistant (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Diane Williams located?
- Diane Williams's practice location on file with NPPES is 323 S Union Ave, Havre De Grace, MD 21078-3201.
- What is Diane Williams's phone number?
- The practice phone number listed in the NPPES registry for Diane Williams is (410) 939-0961.
- Does Diane Williams accept Medicare?
- Diane Williams is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Diane Williams's NPI active?
- Yes — Diane Williams's NPI (1285609438) is active in the NPPES registry as of the last update on 2018-02-28.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.