Mary Hammar, MPH, RD, LDN
NPI 1417532698 · Registered Dietitian · Cambridge, MA
Mary Hammar, MPH, RD, LDN is a Registered Dietitian provider in Cambridge, MA (NPI 1417532698).
Provider details
- NPI number
- 1417532698
- Entity type
- Individual
- Primary specialty
- Registered DietitianDietary & Nutritional Service Providers
- Credential
- MPH, RD, LDN
- Sex
- Female
- Sole proprietor
- No
- License
- 1122 (NH)
Specialties & taxonomies
Dietary & Nutritional Service Providers
Dietary & Nutritional Service Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
5 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
- 2021-03-10
- Last updated
- 2021-03-10
- Certified
- 2021-03-10
Frequently asked questions
- What is Mary Hammar's NPI number?
- Mary Hammar's National Provider Identifier (NPI) is 1417532698, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mary Hammar's specialty?
- Mary Hammar is listed in the NPPES registry with a primary specialty of Registered Dietitian (Dietary & Nutritional Service Providers).
- Where is Mary Hammar located?
- Mary Hammar's practice location on file with NPPES is 1493 Cambridge St, Cambridge, MA 02139-1047.
- What is Mary Hammar's phone number?
- The practice phone number listed in the NPPES registry for Mary Hammar is (617) 665-1000.
- Is Mary Hammar's NPI active?
- Yes — Mary Hammar's NPI (1417532698) is active in the NPPES registry as of the last update on 2021-03-10.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.