John Mercer, MD
John Mercer, MD is an Obstetrics & Gynecology Physician in Nampa, ID, registered under NPI 1205988540. NPPES records them as a sole proprietor, meaning the practice is not incorporated as a separate legal entity.
Getting there
The practice address on file is 4424 E FLAMINGO AVE STE 200, Nampa, ID 83687. 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 |
|---|---|---|
| 3971468 | ID | Obstetrics & Gynecology Physician primary |
| L023779 | LA | Obstetrics & Gynecology Physician |
| CDR.0000210 | CO | Obstetrics & Gynecology Physician |
Licences are recorded in 3 states: ID, LA, CO. Providers licensed in several states often practise near a state border or deliver telehealth across state lines.
- Status
- Approved
- Provider type
- Practitioner - Obstetrics/gynecology
- PAC ID
- 5193610897
Medicare enrolment is recorded as approved under the provider type Practitioner - Obstetrics/gynecology. This means the provider is enrolled to bill Medicare, though it does not tell you whether they are currently accepting new Medicare patients. Call the office to confirm.
Licensed in 3 states
This provider holds licences in 3 states: Colorado, Idaho and Louisiana. The practice address on file is in Nampa, ID, but a licence in another state usually means they see patients there too — either at a second location or by telehealth. If the address above is far from you, it is worth calling to ask whether they practise closer to where you live.
- Licence
- CDR.0000210
- Specialty
- Obstetrics & Gynecology Physician
- Licence
- 3971468
- Specialty
- Obstetrics & Gynecology Physician
Licence numbers are self-reported to NPPES at registration. They do not confirm a licence is currently active, in good standing, or valid for the specialty shown — only the state board can tell you that, which is why we link to each one.
What Obstetrics & Gynecology covers
An obstetrician/gynecologist possesses special knowledge, skills and professional capability in the medical and surgical care of the female reproductive system and associated disorders. This physician serves as a consultant to other physicians and as a primary physician for women. NUCC Health Care Provider Taxonomy, code 207V00000X
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 | |
|---|---|---|---|---|
| 207V00000X | Obstetrics & Gynecology Physician | 3971468 | ID | primary |
| 207V00000X | Obstetrics & Gynecology Physician | L023779 | LA | |
| 207V00000X | Obstetrics & Gynecology Physician | CDR.0000210 | CO |
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 | 1205988540 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Jan 17, 2007 |
| Last updated | Sep 2, 2025 |
| Status | Active |
| Sole proprietor | Yes |
| Credential | MD |
| Practice address |
4424 E FLAMINGO AVE STE 200 Nampa, ID 83687 (208) 302-1400 Fax (208) 302-1455 |
| Mailing address |
715 S 3RD ST Montrose, CO 81401 |
| Other identifiers |
L023779
· STATE LICENSE (LA) 9000166884 (CO) 1487163 (LA) |
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 | 2 | 0 | 5 | 9 | 8 | 8 | 5 | 4 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 2 | 0 | 5 | 9 | 8 | 7 | 5 | 8 |
Sum = 70 · next multiple of 10 = 70 · check digit = 0 · actual last digit = 0
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.