NPI age
19 years
Enumerated 2007-01-17
● Active
Type 1 · Individual
DR. John Whitney Mercer JR., MD
Mercer is 1 of 24 obstetrics & gynecology providers in Nampa and 1 of 228 in Idaho.
Primary specialty
Obstetrics & Gynecology
Plus 2 subspecialties
Licensed in
ID, LA, CO
3 states
Status
Active
No deactivations on record
Last NPPES update
2025-09-02
Source: monthly bulk 2026-05
Sole proprietor
Yes
Solo practice on file
How this provider compares
Across 228 active obstetrics & gynecology providers in Idaho.
NPI age
19 years
≈ at median (19 yr)
State licenses
3 states
Top 72% — 27% of peers are multi-state
Subspecialties
0
42% of peers hold subspecialties
NPI lifetime · 2007 → 2026
2007-01Enumerated in NPPES
2007
2026
Where they practice
Practice location
4424 E Flamingo Ave Ste 200
Nampa, ID 836879300
Mailing address
715 S 3rd St
Montrose, CO 814014209
Additional practice locations
2 secondary locations on file with NPPES.
Location 2
715 S 3rd St
Montrose, CO 814014209
Location 3
900 S 4th St
Montrose, CO 814014226
Specialties
-
Obstetrics & Gynecology PrimaryAn 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...
Identifiers
| Type | Value | Notes |
|---|---|---|
| 01 (LA) | L023779 | STATE LICENSE |
| 05 (CO) | 9000166884 | |
| 05 (LA) | 1487163 |
Multi-state credentialing: Licensed in 3 states. Useful context for credentialers building cross-state provider networks.
Practice context
Part of a multi-provider practice. 3 other active providers share this practice address in NPPES.
Provyx · Custom healthcare lists
Need all 228 Obstetrics & Gynecology providers in Idaho?
Get the full list as a CSV with verified work emails, direct phones, and LinkedIn URLs.
Request a quote →How to verify this provider
- Confirm the NPI on NPPES.The CMS registry is the system of record. Open NPPES →
- Check the state license is currently active.State licensing boards publish current status; NPPES does not.
- Confirm payer enrollment if billing.NPI presence does not guarantee active enrollment with Medicare, Medicaid, or commercial payers.