Mary Hammel, FNP
NPI 1598067779 · Family Nurse Practitioner · Fenton, MO
Enrolled with Medicare as Practitioner - Nurse Practitioner · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mary Hammel, FNP is a Family Nurse Practitioner provider in Fenton, MO (NPI 1598067779).
Provider details
- NPI number
- 1598067779
- Entity type
- Individual
- Primary specialty
- Family Nurse PractitionerPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- FNP
- Sex
- Female
- Sole proprietor
- No
- License
- 2010035829 (MO)
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
15 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
38 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) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 27 | $105 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 11 | $105 |
Typical Medicare-allowed amounts for these services range $105–$105 (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 · 13 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Lisinopril | 42 | 15 |
| Atorvastatin Calcium | 40 | 16 |
| Amlodipine Besylate | 33 | 15 |
| Buspirone Hcl | 23 | — |
| Metformin Hclbrand: Metformin Hcl Er | 20 | — |
| Rosuvastatin Calcium | 17 | — |
| Duloxetine Hcl |
Practice location
Mailing address
Registry dates
- Enumerated
- 2010-11-22
- Last updated
- 2015-04-14
Frequently asked questions
- What is Mary Hammel's NPI number?
- Mary Hammel's National Provider Identifier (NPI) is 1598067779, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mary Hammel's specialty?
- Mary Hammel is listed in the NPPES registry with a primary specialty of Family Nurse Practitioner (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Mary Hammel located?
- Mary Hammel's practice location on file with NPPES is 1203 Smizer Mill Rd, Fenton, MO 63026-3483.
- What is Mary Hammel's phone number?
- The practice phone number listed in the NPPES registry for Mary Hammel is (636) 717-1350.
- Does Mary Hammel accept Medicare?
- Mary Hammel is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mary Hammel's NPI active?
- Yes — Mary Hammel's NPI (1598067779) is active in the NPPES registry as of the last update on 2015-04-14.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.