Doctor profile · Federal record
Dr. John Armstrong, MD
Gynecology Physician (CMS: Obstetrics/Gynecology) · Napa, CA
- NPI 1790875995
- Accepts Medicare
- MIPS 75.0 / 100 · 2023
- 50 yrs in practice
- Male
- Group practice
- No sanctions
Practice & contact
- Primary practice
-
3434 Villa Ln, Suite 360
Napa, CA 94558
(707) 257-4317
fax (707) 257-4319
Credentials & registration
- NPI registered
- October 2006 — 20 yrs on file
- Profile last updated
- July 8, 2007
- Year of graduation
- 1976 — 50 yrs since
- Specialty taxonomy
- 207VG0400X — NUCC code
- State license (1)
- California #00C378990
- Medicaid
- CA #ZZR0009F
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1790875995. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
1,842
Distinct HCPCS
10
Medicare allowed
$186,153
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99214 |
Established patient office or other outpatient visit, 30-39 minutes | 462 | 193 | $127 | |
76641 |
Complete ultrasound scan of 1 breast | 181 | 170 | $121 | |
76830 |
Ultrasound scan of uterus, ovaries, tubes, cervix and pelvic area through vagina | 178 | 156 | $142 | |
56820 |
Exam of external female genitals using an endoscope | 174 | 134 | $103 | |
G0444 |
Annual depression screening, 5 to 15 minutes | 151 | 151 | $22 | |
57452 |
Exam of cervix and upper part of vagina using an endoscope | 119 | 107 | $143 | |
99213 |
Established patient office or other outpatient visit, 20-29 minutes | 97 | 73 | $76 | |
99215 |
Established patient office or other outpatient visit, 40-54 minutes | 96 | 68 | $188 | |
Q0091 |
Screening papanicolaou smear; obtaining, preparing and conveyance of cervical or vaginal smear to laboratory | 87 | 87 | $51 | |
G0101 |
Cervical or vaginal cancer screening; pelvic and clinical breast examination | 86 | 86 | $44 |
In context: peer comparison
Among 1 peers in Napa Gynecology Physician, average services per provider: 115. This provider delivers 16× the peer median.Open Payments
Industry payments received
All-time total
$159
Transactions
8
Manufacturers
6
| Payer (manufacturer) | Industry | Txns | Amount |
|---|---|---|---|
| Radius Health, INC. | 3 | $66.83 | |
| Pfizer INC. | 1 | $20.72 | |
| Abbvie INC. | 1 | $20.05 | |
| Organon LLC | 1 | $18.69 | |
| Astellas Pharma US INC | 1 | $17.62 | |
| Sumitomo Pharma America, INC. | 1 | $15.35 |
By nature of payment
Medicare Part D · 2023
Top prescriptions
Total claims
498
Patients
127
Total drug cost
$159,601
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Estradiol | Generic | 223 | 74 | $11,317 |
| Progesterone (Progesterone, Micronized) | Brand | 77 | 20 | $4,358 |
| Tymlos (Abaloparatide) | Brand | 41 | 0 | $106,481 |
| Terconazole | Generic | 35 | 21 | $1,505 |
| Premarin (Estrogens, Conjugated) | Brand | 26 | 0 | $14,777 |
| Estradiol (Twice Weekly) (Estradiol) | Brand | 20 | 0 | $2,601 |
| Imvexxy (Estradiol) | Brand | 19 | 0 | $9,092 |
| Yuvafem (Estradiol) | Brand | 16 | 0 | $2,146 |
| Nitrofurantoin Mono-Macro (Nitrofurantoin Monohyd/M-Cryst) | Brand | 15 | 12 | $345 |
| Acyclovir | Generic | 13 | 0 | $95 |
Hospital affiliations
Frequently asked questions
What is Dr. John Armstrong's medical specialty?
Dr. John Armstrong practices Gynecology Physician in Napa, CA.
Where does Dr. John Armstrong practice?
Dr. John Armstrong practices at 3434 Villa Ln, Napa, CA 94558. Office phone: 7072574317.
What is Dr. John Armstrong's NPI?
Dr. John Armstrong's National Provider Identifier (NPI) is 1790875995, issued by NPPES.
Does Dr. John Armstrong accept Medicare assignment?
Yes. Dr. John Armstrong accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. John Armstrong commonly perform?
Top Medicare-reported procedures in 2023: Established patient office or other outpatient visit (HCPCS 99214); Complete ultrasound scan of 1 breast (HCPCS 76641); Ultrasound scan of uterus, ovaries, tubes, cervix and pelvic area through vagina (HCPCS 76830). Source: CMS Medicare Physician & Other Practitioners file.