Kate Massman, RD
Kate Massman, RD is a Pediatric Nutrition Registered Dietitian in Saint Louis, MO, registered under NPI 1255261525.
Getting there
The practice address on file is 1 CHILDRENS PL DIV PED ENDOCRINOLOGY AND DIABETES, Saint Louis, MO 63110. We have not yet mapped what surrounds this office — parking, transit, and nearby pharmacies are added as our data collection reaches each location.
Credentials and Medicare
| Licence | State | Specialty |
|---|---|---|
| 2021009243 | MO | Pediatric Nutrition Registered Dietitian primary |
This provider holds licence 2021009243 issued in MO. A licence number in NPPES reflects what was filed at registration — it does not confirm the licence is still active today.
This NPI does not appear in the PECOS Medicare enrolment file. Providers who do not bill Medicare — or who bill only through a group's enrolment — will not appear here. It is not a sign of any problem with the registration.
What Nutrition, Pediatric covers
An individual who is a Board Certified Specialist in Pediatric Nutrition and applies evidence-based nutrition knowledge in providing medical nutrition therapy for pediatric patients. Specialists work directly with healthy and/or ill children (newborn up to 21 years of age) as well as children with special health care needs in a variety of settings (hospitals, community-based and/or family-centered programs, education programs, home, etc.), OR indirectly through management, care coordination, education, quality improvement, or research practice linked specifically to pediatric nutrition. NUCC Health Care Provider Taxonomy, code 133VN1004X
The taxonomy records how the provider classifies their own practice. It does not confirm which conditions they currently treat, whether they are accepting new patients, or which insurance they take — call the office for that.
Full NPPES record
An NPI-1 identifies a single person. It stays with the clinician for life, even if they move practice or change state, which is why the address on file can lag behind where they actually work today.
| NPI | 1255261525 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | May 20, 2026 |
| Last updated | Jul 28, 2026 |
| Status | Active |
| Sole proprietor | No |
| Gender | Female |
| Credential | RD |
| Practice address |
1 CHILDRENS PL DIV PED ENDOCRINOLOGY AND DIABETES Saint Louis, MO 63110 (314) 454-6051 Fax (314) 454-6225 |
| Mailing address |
PO BOX 7412011 Chicago, IL 60674 |
Number check
How the check works, step by step
Every NPI carries a Luhn check digit — the same scheme used on credit cards. CMS prefixes the number with 80840 before computing it, which marks it as a US health identifier.
| Digit | 8 | 0 | 8 | 4 | 0 | 1 | 2 | 5 | 5 | 2 | 6 | 1 | 5 | 2 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 2 | 1 | 5 | 4 | 6 | 2 | 5 | 4 |
Sum = 55 · next multiple of 10 = 60 · check digit = 5 · actual last digit = 5
A valid check digit only means the number is well-formed. It does not mean the provider is licensed, active, or in good standing — those are separate questions answered by the sections above.