Marissa Mahan, DNP, FNP-BC
NPI 1215531264 · Family Nurse Practitioner · Chatham, IL
Enrolled with Medicare as Practitioner - Nurse Practitioner · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Marissa Mahan, DNP, FNP-BC is a Family Nurse Practitioner provider in Chatham, IL (NPI 1215531264).
Provider details
- NPI number
- 1215531264
- Entity type
- Individual
- Primary specialty
- Family Nurse PractitionerPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- DNP, FNP-BC
- Sex
- Female
- Sole proprietor
- No
- License
- 2020014749 (MO)
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
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
5 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
189 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 | 74 | $104 |
| Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'SG2211 | 66 | $13 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 36 | $74 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 13 | $137 |
Typical Medicare-allowed amounts for these services range $13–$137 (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 · 21 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Amlodipine Besylate | 39 | 18 |
| Atorvastatin Calcium | 37 | 22 |
| Metformin Hcl | 19 | 13 |
| Gabapentin | 19 | — |
| Lisinopril | 19 | 11 |
| Trazodone Hcl | 19 | 12 |
| Citalopram Hydrobromide |
Practice location
Mailing address
Registry dates
- Enumerated
- 2020-11-30
- Last updated
- 2024-05-20
- Certified
- 2024-05-20
Frequently asked questions
- What is Marissa Mahan's NPI number?
- Marissa Mahan's National Provider Identifier (NPI) is 1215531264, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Marissa Mahan's specialty?
- Marissa Mahan is listed in the NPPES registry with a primary specialty of Family Nurse Practitioner (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Marissa Mahan located?
- Marissa Mahan's practice location on file with NPPES is 101 E Plummer Blvd, Chatham, IL 62629-8047.
- What is Marissa Mahan's phone number?
- The practice phone number listed in the NPPES registry for Marissa Mahan is (217) 483-3487.
- Does Marissa Mahan accept Medicare?
- Marissa Mahan is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Marissa Mahan's NPI active?
- Yes — Marissa Mahan's NPI (1215531264) is active in the NPPES registry as of the last update on 2024-05-20.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.