Marc Williams, MD
NPI 1992807655 · Clinical Genetics (M.D.) Physician · Danville, PA
Enrolled with Medicare as Practitioner - Pediatric Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Marc Williams, MD is a Clinical Genetics (M.D.) Physician provider in Danville, PA (NPI 1992807655).
Provider details
- NPI number
- 1992807655
- Entity type
- Individual
- Primary specialty
- Clinical Genetics (M.D.) PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- MD444648 (PA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
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
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
- 2006-09-02
- Last updated
- 2020-08-12
- Certified
- 2020-08-12
Frequently asked questions
- What is Marc Williams's NPI number?
- Marc Williams's National Provider Identifier (NPI) is 1992807655, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Marc Williams's specialty?
- Marc Williams is listed in the NPPES registry with a primary specialty of Clinical Genetics (M.D.) Physician (Allopathic & Osteopathic Physicians).
- Where is Marc Williams located?
- Marc Williams's practice location on file with NPPES is 100 N Academy Ave, Danville, PA 17822-1005.
- What is Marc Williams's phone number?
- The practice phone number listed in the NPPES registry for Marc Williams is (570) 214-7941.
- Does Marc Williams accept Medicare?
- Marc Williams is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Marc Williams's NPI active?
- Yes — Marc Williams's NPI (1992807655) is active in the NPPES registry as of the last update on 2020-08-12.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.