Kathryn Diemer, MD
NPI 1891713590 · Endocrinology, Diabetes & Metabolism Physician · Saint Louis, MO
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Kathryn Diemer, MD is a Endocrinology, Diabetes & Metabolism Physician provider in Saint Louis, MO (NPI 1891713590).
Provider details
- NPI number
- 1891713590
- Entity type
- Individual
- Primary specialty
- Endocrinology, Diabetes & Metabolism PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- R1G54 (MO)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
19 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
3,342 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. 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.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Dxa Bone Density Measurement of Hip, Pelvis, Spine77080 | 1,489 | $37 |
| Calculation of Trabecular Bone Score (tbs) Using Imaging Data With Interpretation and Report on Fracture Risk77089 | 1,103 | $38 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 482 | $87 |
| Injection of Drug Or Substance Under Skin Or Into Muscle96372 | 268 | $14 |
Typical Medicare-allowed amounts for these services range $14–$87 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 3 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Ergocalciferol (vitamin D2)brand: Vitamin D2 | 40 | 18 |
| Abaloparatidebrand: Tymlos | 35 | — |
| Teriparatide | 25 | — |
Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they do notinclude cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means no Part D record, never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-07-18
- Last updated
- 2025-04-17
Frequently asked questions
- What is Kathryn Diemer's NPI number?
- Kathryn Diemer's National Provider Identifier (NPI) is 1891713590, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Kathryn Diemer's specialty?
- Kathryn Diemer is listed in the NPPES registry with a primary specialty of Endocrinology, Diabetes & Metabolism Physician (Allopathic & Osteopathic Physicians).
- Where is Kathryn Diemer located?
- Kathryn Diemer's practice location on file with NPPES is 10 Barnes West Dr, Saint Louis, MO 63141-6287.
- What is Kathryn Diemer's phone number?
- The practice phone number listed in the NPPES registry for Kathryn Diemer is (314) 454-7775.
- Does Kathryn Diemer accept Medicare?
- Kathryn Diemer is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Kathryn Diemer's NPI active?
- Yes — Kathryn Diemer's NPI (1891713590) is active in the NPPES registry as of the last update on 2025-04-17.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.