Gregory Marshall, FNP-C
Gregory Marshall, FNP-C is an Interventional Pain Medicine Physician in Evansville, IN, registered under NPI 1528555216. This provider registers 3 separate taxonomy codes, which usually means they practise across more than one recognised specialty.
Getting there
The practice address on file is 4411 WASHINGTON AVE STE 100, Evansville, IN 47714. We have not yet mapped what surrounds this office — parking, transit, and nearby pharmacies are added as our data collection reaches each location.
Credentials and Medicare
| Licence | State | Specialty |
|---|---|---|
| 28207276A | IN | Family Nurse Practitioner |
| 71007920A | IN | Interventional Pain Medicine Physician primary |
| 28207276A | IN | Nurse Practitioner |
This provider holds licence 28207276A issued in IN. A licence number in NPPES reflects what was filed at registration — it does not confirm the licence is still active today.
- Status
- Approved
- Provider type
- Practitioner - Nurse Practitioner
- PAC ID
- 3577826668
- Enrollment ID
- I20180425000614
Medicare enrolment is recorded as approved under the provider type Practitioner - Nurse Practitioner. Being enrolled means the provider can bill Medicare; it does not tell you whether they are currently accepting new Medicare patients. Call the office to confirm.
What Interventional Pain Medicine covers
Interventional Pain Medicine is the discipline of medicine devoted to the diagnosis and treatment of pain and related disorders principally with the application of interventional techniques in managing subacute, chronic, persistent, and intractable pain, independently or in conjunction with other modalities of treatment. NUCC Health Care Provider Taxonomy, code 208VP0014X
All registered taxonomy codes
This provider registers 3 taxonomy codes. The primary code is what appears on most claims; the others record additional recognised specialties.
| Code | Specialty | Licence | State | |
|---|---|---|---|---|
| 363LF0000X | Family Nurse Practitioner Family | 28207276A | IN | |
| 208VP0014X | Interventional Pain Medicine Physician Interventional Pain Medicine | 71007920A | IN | primary |
| 363L00000X | Nurse Practitioner | 28207276A | IN |
The taxonomy records how the provider classifies their own practice. It does not confirm which conditions they currently treat, whether they are accepting new patients, or which insurance they take — call the office for that.
Full NPPES record
An NPI-1 identifies a single person. It stays with the clinician for life, even if they move practice or change state, which is why the address on file can lag behind where they actually work today.
| NPI | 1528555216 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Apr 18, 2018 |
| Last updated | Dec 1, 2025 |
| Status | Active |
| Sole proprietor | No |
| Gender | Male |
| Credential | FNP-C |
| Practice address |
4411 WASHINGTON AVE STE 100 Evansville, IN 47714 (812) 437-7246 |
| Mailing address |
29943 NETWORK PL Chicago, IL 60673 |
| Other identifiers |
30006626
· Medicaid (IN) |
Number check
How the check works, step by step
Every NPI carries a Luhn check digit — the same scheme used on credit cards. CMS prefixes the number with 80840 before computing it, which marks it as a US health identifier.
| Digit | 8 | 0 | 8 | 4 | 0 | 1 | 5 | 2 | 8 | 5 | 5 | 5 | 2 | 1 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 5 | 4 | 8 | 1 | 5 | 1 | 2 | 2 |
Sum = 54 · next multiple of 10 = 60 · check digit = 6 · actual last digit = 6
A valid check digit only means the number is well-formed. It does not mean the provider is licensed, active, or in good standing — those are separate questions answered by the sections above.