Gregory Marshall, FNP-C
NPI 1528555216 · Interventional Pain Medicine Physician · Evansville, IN
Enrolled with Medicare as Practitioner - Nurse Practitioner · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Gregory Marshall, FNP-C is a Interventional Pain Medicine Physician provider in Evansville, IN (NPI 1528555216).
Provider details
- NPI number
- 1528555216
- Entity type
- Individual
- Primary specialty
- Interventional Pain Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- FNP-C
- Sex
- Male
- Sole proprietor
- No
- License
- 28207276A (IN)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
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 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
547 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) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 423 | $98 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 124 | $69 |
Typical Medicare-allowed amounts for these services range $69–$98 (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 · 20 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen | 939 | 148 |
| Oxycodone Hcl/Acetaminophenbrand: Oxycodone-Acetaminophen | 846 | 146 |
| Gabapentin | 527 | 93 |
| Cyclobenzaprine Hcl | 246 | 43 |
| Tizanidine Hcl | 211 | 49 |
| Oxycodone Hcl | 156 | 27 |
| Pregabalin |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$94 across 6 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
- 2018-04-18
- Last updated
- 2025-12-01
- Certified
- 2025-12-01
Frequently asked questions
- What is Gregory Marshall's NPI number?
- Gregory Marshall's National Provider Identifier (NPI) is 1528555216, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Gregory Marshall's specialty?
- Gregory Marshall is listed in the NPPES registry with a primary specialty of Interventional Pain Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Gregory Marshall located?
- Gregory Marshall's practice location on file with NPPES is 4411 Washington Ave Ste 100, Evansville, IN 47714-0805.
- What is Gregory Marshall's phone number?
- The practice phone number listed in the NPPES registry for Gregory Marshall is (812) 437-7246.
- Does Gregory Marshall accept Medicare?
- Gregory Marshall is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Gregory Marshall's NPI active?
- Yes — Gregory Marshall's NPI (1528555216) is active in the NPPES registry as of the last update on 2025-12-01.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.