How to Find OB/GYN Physicians by Zip Code
Data sourced from live CMS NPI Registry API v2.1 queries, run June 13, 2026. All provider counts are real API responses, not estimates. Raw query results are available for download. See methodology below.
taxonomy_description=Obstetrics+%26+Gynecology — the ampersand (&) and spaces on either side are significant. OB/GYN returns zero results. OBGYN returns zero results. Both confirmed June 13, 2026. The Memphis dataset reveals a subspecialty structure more complex than many reps expect: of 65 records, 16 were Maternal & Fetal Medicine specialists (perinatologists) and only 3 were plain OB/GYN generalists. Gynecologic Oncology (10 records) and Nurse Practitioner OB/GYN (10 records) also dominated. This guide covers the exact taxonomy string, 9-market real counts, the subspecialty taxonomy table with NUCC codes, and how to build a product-appropriate call list from the mixed result set.
taxonomy_description=OB/GYN → 0 results. taxonomy_description=OBGYN → 0 results. Both confirmed June 13, 2026. The CMS taxonomy string is Obstetrics & Gynecology — with spaces around the ampersand. In API calls, encode the ampersand as %26: taxonomy_description=Obstetrics+%26+Gynecology. Any pipeline that uses the common abbreviation OB/GYN or omits the ampersand silently returns nothing.
Obstetrics & Gynecology in the NPI registry: real counts from 9 markets
We queried the CMS NPI API v2.1 on June 13, 2026 with taxonomy_description=Obstetrics+%26+Gynecology.
| Market | Query scope | NPI records returned | At 200-record cap? |
|---|---|---|---|
| New York, NY | City filter | 200+ | Yes (more exist) |
| Los Angeles, CA | City filter | 200+ | Yes (more exist) |
| Chicago, IL | City filter | 200+ | Yes (more exist) |
| Houston, TX | City filter | 200+ | Yes (more exist) |
| Phoenix, AZ | City filter | 200+ | Yes (more exist) |
| Nashville, TN | City filter | 163 | No (complete) |
| Memphis, TN | City filter | 65 | No (complete) |
| Vermont (statewide) | State filter | 64 | No (complete) |
| Wyoming (statewide) | State filter | 32 | No (complete) |
Source: CMS NPI Registry API v2.1, taxonomy_description=Obstetrics+%26+Gynecology, limit=200. Queried June 13, 2026. Counts include NPI-1 individual providers and NPI-2 organization records. Nurse Practitioners registered under this taxonomy are included in the totals.
OB/GYN subspecialties: the taxonomy table
| Subspecialty | taxonomy_description value | NUCC code | National June 2026 |
|---|---|---|---|
| General OB/GYN | Obstetrics & Gynecology |
207V00000X | 200+ (capped) |
| Maternal & Fetal Medicine (perinatologist) | Maternal & Fetal Medicine |
207VM0101X | 200+ (capped) — separate query |
| Gynecologic Oncology | Gynecologic Oncology |
207VX0201X | 200+ (capped) — separate query |
| Reproductive Endocrinology & Infertility | Reproductive Endocrinology |
207VE0102X | 200+ (capped) — separate query |
| Gynecology (gyn-only, no obstetrics) | Gynecology |
207VG0400X | Partial-match returns (see warn-box) |
| "OB/GYN" (abbreviation) | Invalid — returns 0 | None | 0 — use Obstetrics & Gynecology |
| "OBGYN" (abbreviation) | Invalid — returns 0 | None | 0 — use Obstetrics & Gynecology |
How to search for OB/GYN physicians by zip code (5 steps)
Choose your search method
- NPI registry directly at npiregistry.cms.hhs.gov — free, no account, city or state filter only. No radius.
- getdork Physician Search — same CMS API with zip-radius filtering, ampersand-encoded taxonomy pre-mapped, CSV export. Search OB/GYN by ZIP →
Use the exact taxonomy string with ampersand
The exact API parameter is taxonomy_description=Obstetrics+%26+Gynecology.
"OB/GYN" and "OBGYN" both return zero. The numeric NUCC code 207V00000X
is silently ignored. In getdork, selecting OB/GYN from the dropdown sends the correct
ampersand-encoded string automatically.
Expect a subspecialized, mixed dataset — not a clean generalist list
A standard OB/GYN query returns a highly mixed dataset. In Memphis, Maternal & Fetal Medicine specialists (16) and Gynecologic Oncology physicians (10) together outnumbered plain OB/GYN generalists (3) by more than 8 to 1. Plan to segment the taxonomy column in your exported CSV before routing to product-line-appropriate reps.
Filter Nurse Practitioners if your call plan targets physicians only
In Memphis, 10 of 65 records were NP-level providers (Nurse Practitioner, Obstetrics & Gynecology). NPs can prescribe but are not MD or DO physicians. If your call plan is physician-only — for device detailing, surgical consumables, or physician-dispensed injectables — filter out records where taxonomy description contains "Nurse Practitioner."
Export to CSV (Pro) and segment by subspecialty before CRM import
Pro users export the complete result set. Column headers: NPI, Name, Credential, Address, City, State, Zip, Phone, Entity Type. Route MFM specialists to perinatal device reps, gynecologic oncologists to oncology pharma reps, REI physicians to fertility product reps, and general OB/GYNs to contraceptive and women's health product reps.
Direct API queries
# OB/GYN physicians in Memphis, TN — returned 65 records (June 2026) https://npiregistry.cms.hhs.gov/api/? version=2.1 &taxonomy_description=Obstetrics+%26+Gynecology &city=Memphis &state=TN &limit=200 # FAILS — OB/GYN abbreviation returns zero results https://npiregistry.cms.hhs.gov/api/? version=2.1 &taxonomy_description=OB%2FGYN &city=Memphis &state=TN &limit=200 # Maternal & Fetal Medicine (perinatologists) — separate taxonomy, 200+ nationally https://npiregistry.cms.hhs.gov/api/? version=2.1 &taxonomy_description=Maternal+%26+Fetal+Medicine &state=TN &limit=200 # Gynecologic Oncology — separate subspecialty taxonomy https://npiregistry.cms.hhs.gov/api/? version=2.1 &taxonomy_description=Gynecologic+Oncology &state=TN &limit=200
Radius guidance for OB/GYN territories
| Market type | Recommended starting radius | Rationale |
|---|---|---|
| Dense urban (NYC, Chicago, LA, Houston) | 10–15 miles | All four metros hit the 200-cap; OB/GYN is well-distributed in cities with large hospital systems and academic medical centers |
| Mid-metro (Memphis, Nashville, Phoenix) | 25 miles | Memphis: 65 records (complete); Nashville: 163 (complete); Phoenix: 200+ (capped). 25 miles captures suburban OB/GYN practices and hospital-employed physicians. |
| Rural (Wyoming, Vermont) | 50 miles | Wyoming: 32 statewide; Vermont: 64 statewide. OB/GYN has better rural coverage than rheumatology or nephrology because maternal care is a fundamental healthcare service in rural hospital systems. |
getdork sends the ampersand-encoded
Obstetrics & Gynecology taxonomy string
and handles the zip-radius math. The exported CSV includes the subspecialty taxonomy column
so you can segment MFM specialists, gynecologic oncologists, reproductive endocrinologists,
and Nurse Practitioners before your CRM import. Free to preview; Pro for the full list and CSV export.
Search OB/GYN physicians by ZIP code — free →
Frequently asked questions
Why do "OB/GYN" and "OBGYN" return zero results in the NPI API?
The CMS NPI API requires an exact match on the taxonomy_description field. "OB/GYN" and
"OBGYN" are not recognized CMS taxonomy strings — both return zero results, confirmed
June 13, 2026. The correct string is Obstetrics & Gynecology with a space,
an ampersand, and another space. URL-encoded: Obstetrics+%26+Gynecology. Any
pipeline using the abbreviation produces a silent zero-result failure with no error message.
What subspecialty groups appear in a standard Obstetrics & Gynecology NPI query?
In Memphis (65 records, June 2026): 16 Maternal & Fetal Medicine (perinatologists), 12 Gynecology-only, 10 Nurse Practitioner OB/GYN, 10 Gynecologic Oncology, 5 Reproductive Endocrinology, 3 plain OB/GYN generalists, 2 Urogynecology, 7 other. MFM specialists outnumbered plain generalists more than 5 to 1 in this academic-medical-center-heavy market.
Do Nurse Practitioners appear in an Obstetrics & Gynecology NPI query?
Yes. In Memphis, 10 of 65 OB/GYN records showed Nurse Practitioner, Obstetrics & Gynecology as primary taxonomy. NPs are mid-level providers who prescribe but are not MD/DO physicians. Filter records where the taxonomy description contains "Nurse Practitioner" if your call plan targets physician prescribers only.
What is the difference between Obstetrics & Gynecology and Gynecology as NPI taxonomy strings?
Obstetrics & Gynecology (207V00000X) is the broad parent taxonomy.
Gynecology (207VG0400X) is a narrower subspecialty for physicians practicing
gynecology only, without obstetrics — typically senior OB/GYNs who have phased out
obstetric call. Obstetrics (207VX0000X) also exists as an obstetrics-only
narrower taxonomy. In Memphis, 12 of 65 records showed Gynecology as primary taxonomy.
Which OB/GYN subspecialty has the highest NPI count nationally?
All major subspecialties hit the 200-cap nationally in June 2026: Maternal & Fetal Medicine (207VM0101X), Gynecologic Oncology (207VX0201X), and Reproductive Endocrinology (207VE0102X). In the Memphis dataset, MFM was the largest single group (16 of 65), reflecting Memphis's academic medical center concentration and the regional perinatal referral role of large tertiary hospitals.
What pharma and device products use an OB/GYN call list?
General OB/GYN: oral contraceptives, IUDs, injectable contraceptives, prenatal vitamins, vaginal atrophy treatments (local estrogen, ospemifene), PCOS therapies, urinary incontinence drugs. MFM specialists: fetal monitoring devices, 17-OHPC progesterone for preterm prevention. Gynecologic oncologists: PARP inhibitors (olaparib, niraparib, rucaparib), bevacizumab, laparoscopy/hysteroscopy capital equipment. Reproductive endocrinologists: IVF consumables, gonadotropin injectables, embryo transfer catheters.
Data methodology
All provider counts come from direct queries to the CMS NPI Registry API v2.1, run on
June 13, 2026. We used taxonomy_description=Obstetrics+%26+Gynecology and
limit=200. No authentication required. Result_count reflects records returned
on that page; when equal to 200 the actual total exceeds 200. Counts below 200 are exact.
We confirmed: OB/GYN → 0 results; OBGYN → 0 results.
Maternal & Fetal Medicine, Gynecologic Oncology, and
Reproductive Endocrinology each returned 200+ nationally (confirmed as active
separate taxonomy strings).
Raw responses: npi-obgyn-memphis-tn-raw.json, npi-obgyn-wyoming-raw.json. Collection script: _data/npi-counts-obgyn.ps1.
Related guides
- How to search the NPI registry (full guide) — complete API reference and the taxonomy_description quirk explained in detail.
- What is an NPI number and what can you look up? — NPI types, fields, and data freshness.
- How to find physicians by specialty and state — state-level NPI searches across specialties.
- How to find gastroenterologists by zip code — another specialty where common abbreviations (GI) return zero results.
- How to find nephrologists by zip code — Renal as a prefix returns dialysis technicians, not physicians.