IndividualActive
Mary Williams, RD
NPI 1588153969 · Registered Dietitian · Washington, DC
Mary Williams, RD is a Registered Dietitian provider in Washington, DC (NPI 1588153969).
Provider details
- NPI number
- 1588153969
- Entity type
- Individual
- Primary specialty
- Registered DietitianDietary & Nutritional Service Providers
- Credential
- RD
- Sex
- Female
- Sole proprietor
- No
Specialties & taxonomies
Dietary & Nutritional Service Providers
Profile Score
Established profile(62/100 index)
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
8 yrs in NPPES 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
50 Irving St Nw
Washington, DC 20422-0001
Phone: (202) 745-8000
Street-level locationGet directions
Mailing address
10362 Castlehedge Ter
Silver Spring, MD 20902-5808
Registry dates
- Enumerated
- 2018-05-01
- Last updated
- 2018-05-01
Frequently asked questions
- What is Mary Williams's NPI number?
- Mary Williams's National Provider Identifier (NPI) is 1588153969, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mary Williams's specialty?
- Mary Williams is listed in the NPPES registry with a primary specialty of Registered Dietitian (Dietary & Nutritional Service Providers).
- Where is Mary Williams located?
- Mary Williams's practice location on file with NPPES is 50 Irving St Nw, Washington, DC 20422-0001.
- What is Mary Williams's phone number?
- The practice phone number listed in the NPPES registry for Mary Williams is (202) 745-8000.
- Is Mary Williams's NPI active?
- Yes — Mary Williams's NPI (1588153969) is active in the NPPES registry as of the last update on 2018-05-01.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.