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Edit this profileAt a glance
- 3434 Villa Ln, Suite 360, Napa, CA 94558
About Dr. Armstrong
John T. Armstrong, MD practices obstetrics/gynecology in Napa, CA. John is a 1976 graduate of Texas Tech University Health Science Center School of Medicine. John is also listed as specializing in gynecology. Medicare claims data shows John provided 1,804 services to 1,328 patients. The services billed most often include established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more, exam of external female genitals using an endoscope, and complete ultrasound scan of 1 breast. The provider's National Provider Identifier (NPI) is 1790875995.
Factual summary compiled by Guide.md from public records; not written by this provider.
Education & Training
Specialty
Credentials & Licensing
Medicare information
Exactly as CMS reports it (National Downloadable File, Opt-Out Affidavits, Order & Referring). Not an insurance directory; confirm coverage with the office.
Contact Information
- (707) 257-4317
- Email not available
Practice Locations
3434 VILLA LN SUITE 360
Napa, CA 94558
Conditions Commonly Evaluated or Treated
Within Obstetrics and Gynecology generally. Availability varies by clinician, training and location — this profile has not been claimed, so nothing here is a personal claim by the provider.
Conditions
Pelvic pain and benign gynecology
- Uterine fibroids
- Chronic pelvic pain
- Ovarian cysts
- Painful intercourse
- Pelvic organ prolapse
- Urinary incontinence in women
Most searched conditions
Infections and vulvovaginal conditions
Menstrual and hormonal
- Absent periods
- Genitourinary syndrome of menopause
- Painful periods
- Perimenopause
- Premenstrual syndrome
Pregnancy
- Ectopic pregnancy
- Gestational diabetes
- Hyperemesis gravidarum
- Miscarriage
- Placenta previa
- Postpartum depression
- Preeclampsia
- Preterm labor
Cancer and precancer
- Abnormal cervical cells and cervical dysplasia
- Cervical cancer
- Endometrial cancer
- Endometrial hyperplasia
- Ovarian cancer
Contraception
- Birth Control Side Effects
Fertility
- Infertility
- Recurrent Miscarriages
Infections
- Chlamydia
- Pelvic Inflammatory Disease (PID)
Pregnancy Complications
- High-risk pregnancy
- Twins or triplets
Vaginal & Vulvar Health
Procedures & services
Most searched procedures
Contraception and office treatment
Pregnancy and delivery
- External cephalic version
- Forceps- or vacuum-assisted delivery
- Prenatal care
- Vaginal childbirth
Preventive and diagnostic
Birth Control
Contraception
Diagnostic Procedures
- Amniocentesis
Fertility
- Egg freezing
- Intrauterine Insemination (IUI)
Hormone & Menopause
- Hormone Replacement Therapy (HRT) Consultation
Laparoscopic and adnexal surgery
- Gynecologic laparoscopy
- Ovarian cyst removal
- Ovary removal
Pelvic floor
Postpartum Care
Pregnancy & Prenatal
Preventive Care
Preventive Screening
Routine Exams
Surgeries
- Endometriosis Excision Surgery
- Labia Reduction
- Tubal Ligation ("Tubes Tied")
Uterine and cervical procedures
Procedures Most Often Billed to Medicare
1,804 services · 1,328 patients · 17 distinct codes
| Procedure | Type | Code | Services | Compared with peers |
|---|---|---|---|---|
| Exam of external female genitals using an endoscope | Procedure | 56820 |
183 | Too few peers to compare |
| Exam of cervix and upper part of vagina using an endoscope | Procedure | 57452 |
109 | Too few peers to compare |
| Irrigation of vagina and/or application of drug to treat infection | Procedure | 57150 |
43 | Too few peers to compare |
| Fitting and insertion of vaginal support device | Procedure | 57160 |
39 | More often than most peers in Obstetrics/Gynecology |
| Complete ultrasound scan of 1 breast | Imaging | 76641 |
180 | More often than most peers in Obstetrics/Gynecology |
| Ultrasound scan of uterus, ovaries, tubes, cervix and pelvic area through vagina | Imaging | 76830 |
175 | More than most peers in Obstetrics/Gynecology |
| Ultrasound of abdomen and pelvis artery and vein blood flow | Treatment | 93976 |
14 | Too few peers to compare |
| Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more | Office visit | 99214 |
413 | More than most peers in Obstetrics/Gynecology |
| Annual depression screening, 5 to 15 minutes | Billing code | G0444 |
135 | More often than most peers in Obstetrics/Gynecology |
| Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more | Office visit | 99215 |
129 | More often than most peers in Obstetrics/Gynecology |
Source: CMS Medicare public data. Shows how often procedures were billed — not quality of care or patient satisfaction.
Related providers
Connections drawn from the registry and from what providers have told us. A link here is not a referral or an endorsement.
Also at this address 4
Providers at the same street address. Each files their own registry entry, so a shared practice often appears under several different names.
Other obstetrics/gynecology specialists in Napa 6
Same specialty, same city.
Trained at Texas Tech University Health Science Center School of Medicine 8
Other providers in the same specialty who trained at the same institution.
More connections — 8 related providers in 1 group
Class of 1976 at Texas Tech University Health Science Center School of Medicine 8
Providers who graduated from the same medical school in the same year.
Common questions
What is Dr. Armstrong's specialty?
Dr. Armstrong is an obstetrics/gynecology in Napa, CA. That is the designation recorded for this NPI in the federal registry.
NPI registry
Where can I find Dr. Armstrong?
Dr. Armstrong is listed at 3434 Villa Ln Suite 360, Napa, CA 94558. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
How do I contact Dr. Armstrong?
The number on file is (707) 257-4317. Contact the office directly to confirm availability and scheduling.
NPI registry
What is the NPI for Dr. Armstrong?
Dr. Armstrong's National Provider Identifier is 1790875995. It is issued by the Centers for Medicare & Medicaid Services and is unique and permanent — it does not change if they move practice.
NPI registry
What is Dr. Armstrong's medical education?
Dr. Armstrong attended Texas Tech University Health Science Center School of Medicine, graduating in 1976. This comes from the CMS National Downloadable File.
CMS public data
How much experience does Dr. Armstrong have?
Dr. Armstrong has 50 years experience. Calculated from a graduation year of 1976, reported in the CMS National Downloadable File.
CMS public data
What is Dr. Armstrong known for?
According to Medicare billing data, Dr. Armstrong performs procedures including exam of external female genitals using an endoscope, exam of cervix and upper part of vagina using an endoscope and irrigation of vagina and/or application of drug to treat infection; reads or performs imaging such as complete ultrasound scan of 1 breast and ultrasound scan of uterus, ovaries, tubes, cervix and pelvic area through vagina; provides treatments such as ultrasound of abdomen and pelvis artery and vein blood flow, alongside routine visits and testing. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Is Dr. Armstrong's profile verified?
Not yet. This profile is built from public federal data and has not been confirmed by Dr. Armstrong. If this is you, claiming it is free.
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