Jennifer Martens, FNP
NPI 1336659523 · Family Nurse Practitioner · O Fallon, IL
Enrolled with Medicare as Practitioner - Nurse Practitioner · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Jennifer Martens, FNP is a Family Nurse Practitioner provider in O Fallon, IL (NPI 1336659523).
Provider details
- NPI number
- 1336659523
- Entity type
- Individual
- Primary specialty
- Family Nurse PractitionerPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- FNP
- Sex
- Female
- Sole proprietor
- No
- License
- 209016645 (IL)
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
8 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
575 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) |
|---|---|---|
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 353 | $99 |
| Hospital Discharge Day Management, More Than 30 Minutes99239 | 119 | $95 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 83 | $66 |
| Advance Care Planning, First 30 Minutes99497 | 20 | $63 |
Typical Medicare-allowed amounts for these services range $63–$99 (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 · 8 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Tamsulosin Hcl | 22 | — |
| Furosemide | 17 | 12 |
| Pantoprazole Sodium | 17 | 13 |
| Isosorbide Mononitratebrand: Isosorbide Mononitrate Er | 16 | — |
| Potassium Chloride | 15 | — |
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen | 14 | 14 |
| Amlodipine Besylate |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$84,279 across 133 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
- 2017-10-03
- Last updated
- 2024-09-10
- Certified
- 2024-09-10
Frequently asked questions
- What is Jennifer Martens's NPI number?
- Jennifer Martens's National Provider Identifier (NPI) is 1336659523, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Jennifer Martens's specialty?
- Jennifer Martens is listed in the NPPES registry with a primary specialty of Family Nurse Practitioner (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Jennifer Martens located?
- Jennifer Martens's practice location on file with NPPES is 1 Saint Elizabeth Blvd, O Fallon, IL 62269-1099.
- What is Jennifer Martens's phone number?
- The practice phone number listed in the NPPES registry for Jennifer Martens is (618) 234-2120.
- Does Jennifer Martens accept Medicare?
- Jennifer Martens is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Jennifer Martens's NPI active?
- Yes — Jennifer Martens's NPI (1336659523) is active in the NPPES registry as of the last update on 2024-09-10.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.