Mariah Messmer
NPI 1477204055 · Family Nurse Practitioner · French Lick, IN
Enrolled with Medicare as Practitioner - Nurse Practitioner · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mariah Messmer is a Family Nurse Practitioner provider in French Lick, IN (NPI 1477204055).
Provider details
- NPI number
- 1477204055
- Entity type
- Individual
- Primary specialty
- Family Nurse PractitionerPhysician Assistants & Advanced Practice Nursing Providers
- Sex
- Female
- Sole proprietor
- No
- License
- 71012150A (IN)
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 tenure25% of score
4 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
164 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
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 .
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) |
|---|---|---|
| Detection Test By Immunoassay With Direct Visual Observation for Influenza Virus87804 | 58 | $16 |
| Amplifed Dna Or Rna Probe Detection of Severe Acute Respiratory Syndrome Coronavirus 2 (covid-19) Antigen87635 | 35 | $50 |
| Detection Test By Nucleic Acid for Strep (streptococcus, Group A), Amplified Probe Technique87651 | 23 | $34 |
| Emergency Department Visit With Low Level of Medical Decision Making99283 | 18 | $54 |
| Emergency Department Visit With Moderate Level of Medical Decision Making99284 | 17 | $94 |
| Automated Urinalysis Test81003 | 13 | $2 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 30 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Lisinopril | 73 | 25 |
| Atorvastatin Calcium | 69 | 26 |
| Levothyroxine Sodium | 45 | 13 |
| Metformin Hcl | 43 | — |
| Losartan Potassium | 43 | — |
| Amlodipine Besylate | 42 | 11 |
| Amoxicillin/Potassium Clav |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$171 across 10 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2022-01-14
- Last updated
- 2022-09-02
- Certified
- 2022-09-02
Frequently asked questions
- What is Mariah Messmer's NPI number?
- Mariah Messmer's National Provider Identifier (NPI) is 1477204055, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mariah Messmer's specialty?
- Mariah Messmer is listed in the NPPES registry with a primary specialty of Family Nurse Practitioner (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Mariah Messmer located?
- Mariah Messmer's practice location on file with NPPES is 679 S State Road 145, French Lick, IN 47432-8328.
- What is Mariah Messmer's phone number?
- The practice phone number listed in the NPPES registry for Mariah Messmer is (812) 936-6400.
- Does Mariah Messmer accept Medicare?
- Mariah Messmer is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mariah Messmer's NPI active?
- Yes — Mariah Messmer's NPI (1477204055) is active in the NPPES registry as of the last update on 2022-09-02.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.