How to Find Rheumatologists by Zip Code

Q: Why does 'Arthritis' return zero results in the NPI registry?

The CMS NPI taxonomy system does not include 'Arthritis' as a taxonomy string. It is a disease condition, not a specialty. 'Rheumatologist' also returns zero — CMS uses specialty names, not practitioner nouns. The only working string for rheumatologists is 'Rheumatology', confirmed June 13, 2026. Pipelines that attempt 'Arthritis Specialist' or 'Arthritis Doctor' as query strings will silently return zero records.

Q: How sparse is rheumatology in rural states, and what radius should I use?

Wyoming statewide returned only 7 rheumatologists (6 individual physicians, 1 group practice) on June 13, 2026. Vermont returned 32 statewide. Houston, the densest city we tested, returned 182. For Wyoming, the practical radius is the entire state — a 100-mile radius from Casper covers most of it. For Vermont, 50 miles from Burlington captures the majority. Even in mid-size metros like Memphis (36 records), a 25-mile radius is appropriate. Never use a 5-mile radius for rheumatology: the specialty is too sparse for tight geographic filters.

Q: How does the Memphis rheumatology dataset break down by entity type and primary taxonomy?

Memphis returned 36 rheumatology records (June 2026): 31 NPI-1 (individual physicians), 5 NPI-2 (group practices). Primary taxonomy: 33 Internal Medicine, Rheumatology (correct targets); 1 Family Medicine, 1 Internal Medicine general, 1 Internal Medicine/Critical Care (noise). Credentials: 15 M.D., 10 MD, 3 M.D (variant), 1 D.O., 1 D.O. — nearly all MDs. The dataset is clean with minimal noise.

Q: Does Pediatric Rheumatology appear in a standard Rheumatology query?

Pediatric Rheumatology (NUCC 2080P0216X) is a separate CMS taxonomy string that requires its own query. Records with Pediatric Rheumatology as primary taxonomy may or may not appear in a standard Rheumatology query, depending on whether the parent taxonomy is also in the record. Nationally, a dedicated Pediatric Rheumatology query returned 200+ records (capped) on June 2026. If your product treats pediatric JIA or pediatric SLE, add a separate Pediatric+Rheumatology query.

Q: Why did Houston return 182 rheumatologists while Phoenix returned only 78?

Both figures are complete (not capped) and reflect genuine provider registration differences. Houston has a larger total population base and a higher concentration of medical school-affiliated rheumatology programs, particularly at UTHealth and Baylor College of Medicine. Phoenix's count (78) reflects NPI records filed under the city of Phoenix specifically — a wider metro-area query including Scottsdale, Tempe, and Mesa would return more. For Phoenix territory planning, use a radius search rather than a city-name filter to avoid undercounting suburban practices.

By the getdork research team — we build and maintain the NPI/physician-search tooling at getdork.com — Published June 13, 2026

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.

To find licensed rheumatologists near a zip code, query the federal NPI registry with taxonomy_description=Rheumatology. Zero-result traps: Rheumatologist returns nothing, and Arthritis returns nothing — both confirmed June 13, 2026. The harder reality of this specialty: rheumatology is genuinely sparse. Wyoming statewide has only 7 rheumatologists total. Memphis returned 36. A 25-mile radius that would give you 160+ cardiologists may give you 8 rheumatologists. This guide covers the correct taxonomy strings, real 9-market counts, the Wyoming drill-down showing all 7 providers, and radius guidance calibrated to the density gap.

Rheumatology is sparse — tune your radius expectations accordingly: Wyoming statewide returned only 7 rheumatologists (6 physicians + 1 group) on June 13, 2026. Vermont returned 32 statewide. taxonomy_description=Rheumatologist → 0 results. taxonomy_description=Arthritis → 0 results. For rural territory reps, a rheumatology call list may have fewer than 10 targets in the entire state — the radius math matters less than the full-state query.

Rheumatology in the NPI registry: real counts from 9 markets

We queried the CMS NPI API v2.1 on June 13, 2026 with taxonomy_description=Rheumatology.

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	182	No (complete)
Phoenix, AZ	City filter	78	No (complete)
Nashville, TN	City filter	65	No (complete)
Memphis, TN	City filter	36	No (complete)
Vermont (statewide)	State filter	32	No (complete)
Wyoming (statewide)	State filter	7	No (complete)

Source: CMS NPI Registry API v2.1, taxonomy_description=Rheumatology, limit=200. Queried June 13, 2026. Counts include both individual providers (NPI-1) and organization records (NPI-2). Wyoming (7) and Vermont (32) are complete statewide counts.

Wyoming drill-down — all 7 rheumatologists in the state: 6 NPI-1 individual physicians and 1 NPI-2 group practice. Individual physicians: Ali H. (M.D.), Lai H.C. (MD), Monger R. (MD), Quilon A. (MD), Schneider H. (MD), Widener B. (M.D.). A rep covering Wyoming rheumatology territory is managing at most 6 physician targets statewide. Territory planning here is about drive time and relationship depth, not radius filtering. Raw data: npi-rheumatology-wyoming-raw.json.

Memphis, TN drill-down — what 36 Rheumatology records look like: 31 were individual providers (NPI-1); 5 were organization records (NPI-2). Primary taxonomy: 33 Internal Medicine, Rheumatology, 1 Family Medicine, 1 Internal Medicine (general), 1 Internal Medicine, Critical Care Medicine. Credentials: 15 "M.D.," 10 "MD," 3 "M.D," 1 D.O., 1 "D.O." The dataset is clean — 33 of 36 are genuine rheumatology targets. Raw data: npi-rheumatology-memphis-tn-raw.json.

Rheumatology subspecialties: the taxonomy table

Subspecialty	taxonomy_description value	NUCC code	National June 2026
General rheumatologist	`Rheumatology`	207RR0500X	200+ (capped)
Pediatric rheumatologist	`Pediatric Rheumatology`	2080P0216X	200+ (capped) — separate query required
"Rheumatologist" (practitioner noun)	Invalid — returns 0	None	0 — use Rheumatology
"Arthritis" (disease term)	Invalid — returns 0	None	0 — not a CMS taxonomy string

How to search for rheumatologists 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, correct taxonomy pre-mapped, CSV export. Search rheumatologists by ZIP →

Use the correct taxonomy string: Rheumatology

The exact API parameter is taxonomy_description=Rheumatology. "Rheumatologist" returns zero; "Arthritis" returns zero. The numeric NUCC code 207RR0500X is silently ignored. In getdork, selecting Rheumatology from the dropdown sends the correct string automatically.

Start with a state-level query in sparse markets

In Wyoming and Vermont, start with a statewide query rather than a city-radius search. Wyoming has 7 rheumatologists total — a city filter on Cheyenne may return only 2. A statewide pull gives you the complete territory picture first; then plan your call route by provider location, not radius rings.

Use 50–100 mile radius for rural territory planning

In markets where rheumatology is sparse, a 25-mile radius may capture only 3–4 providers. Start at 50 miles for mid-rural areas and expand to 100 miles in frontier states. Houston (182 providers) and New York (200+) are the dense-end exceptions where a 15–25 mile radius is sufficient.

Export to CSV (Pro) and segment Pediatric Rheumatology

Pro users export the complete result set. Column headers: NPI, Name, Credential, Address, City, State, Zip, Phone, Entity Type. Pediatric Rheumatology records (separate taxonomy, 200+ nationally) can be captured with a second query and merged with the adult list before CRM import.

Direct API queries

# Rheumatologists in Memphis, TN — returned 36 records (June 2026)
https://npiregistry.cms.hhs.gov/api/?
  version=2.1
  &taxonomy_description=Rheumatology
  &city=Memphis
  &state=TN
  &limit=200

# Wyoming statewide — returned 7 records total (June 2026)
https://npiregistry.cms.hhs.gov/api/?
  version=2.1
  &taxonomy_description=Rheumatology
  &state=WY
  &limit=200

# FAILS — Rheumatologist (noun form) returns zero results
https://npiregistry.cms.hhs.gov/api/?
  version=2.1
  &taxonomy_description=Rheumatologist
  &state=WY
  &limit=200

# Pediatric Rheumatology — separate taxonomy, 200+ nationally
https://npiregistry.cms.hhs.gov/api/?
  version=2.1
  &taxonomy_description=Pediatric+Rheumatology
  &limit=200

Radius guidance for rheumatology territories

Market type	Recommended starting radius	Rationale
Dense urban (NYC, Chicago, LA)	15–25 miles	Three metros hit the 200-cap; Houston returned 182 for city-only. Rheumatology is concentrated in academic medical centers and infusion-capable group practices.
Mid-metro (Memphis, Nashville, Phoenix)	25–50 miles	Memphis: 36 records; Nashville: 65; Phoenix: 78 city-only. 25 miles for Memphis/Nashville; 25–50 for Phoenix metro (suburban spread).
Rural (Wyoming, Vermont)	50–100 miles or full state	Wyoming: 7 statewide; Vermont: 32 statewide. In Wyoming, use a statewide filter rather than radius; the state is the territory. Vermont: 50 miles from Burlington captures the majority.

Your rheumatology territory from the federal source of record.
getdork sends taxonomy_description=Rheumatology and handles the radius math. For rural reps in sparse states, it lets you pull the full statewide list in one search rather than guessing city names. Free to preview; Pro for the full list and CSV export.

Search rheumatologists by ZIP code — free →

Frequently asked questions

Why does "Arthritis" return zero results in the NPI registry?

The CMS NPI taxonomy system does not include disease conditions as taxonomy strings. "Arthritis" is a condition, not a specialty. "Rheumatologist" also returns zero — CMS uses specialty names, not practitioner nouns. The only working string is Rheumatology. Pipelines using "Arthritis Specialist," "Arthritis Doctor," or "Rheumatologist" as query values will silently return zero records with no error.

How sparse is rheumatology in rural states, and what radius should I use?

Wyoming statewide returned 7 rheumatologists; Vermont returned 32. For Wyoming, use a statewide filter — the territory is the state. For Vermont, 50 miles from Burlington captures most providers. Even mid-size metros are thin: Memphis has 36, Nashville 65. Never use a 5-mile radius for rheumatology; the specialty is too sparse for tight geographic filters anywhere outside major urban cores.

What does the full Wyoming rheumatology call list look like?

Wyoming's complete statewide rheumatology dataset (June 2026) contains 7 records: 6 individual physicians and 1 group practice. A rep covering Wyoming rheumatology territory is managing at most 6 physician targets statewide. Territory planning in this state is about relationship frequency and drive logistics, not geographic radius filtering.

How does the Memphis rheumatology dataset break down by entity type and primary taxonomy?

Memphis returned 36 records (June 2026): 31 NPI-1 (individual physicians), 5 NPI-2 (group practices). Primary taxonomy: 33 Internal Medicine, Rheumatology; 1 Family Medicine; 1 Internal Medicine; 1 Internal Medicine, Critical Care. Credentials: 15 M.D., 10 MD, 3 M.D, 1 D.O., 1 D.O. The dataset is clean with minimal noise (3 of 36 non-rheumatology records).

Does Pediatric Rheumatology appear in a standard Rheumatology query?

Pediatric Rheumatology (NUCC 2080P0216X) requires its own dedicated query. Nationally, a dedicated Pediatric Rheumatology query returned 200+ records in June 2026. If your product treats pediatric juvenile idiopathic arthritis (JIA) or pediatric SLE, add a separate Pediatric+Rheumatology query to supplement the adult rheumatology list.

What biologics and device products use a rheumatology call list?

TNF inhibitors (adalimumab, etanercept, certolizumab, golimumab) for RA, PsA, and AS; IL-6 inhibitors (tocilizumab, sarilumab) for RA; JAK inhibitors (tofacitinib, baricitinib, upadacitinib, filgotinib) for RA and PsA; anti-CD20 (rituximab) for severe RA; BLyS inhibitors (belimumab) and anti-interferon (anifrolumab) for SLE; IL-17/23 inhibitors for PsA; joint aspiration and injection supplies; DEXA scan equipment for osteoporosis monitoring.

Why did Houston return 182 rheumatologists while Phoenix returned only 78?

Both are complete (not capped) city-scoped counts. Houston has a larger population and a higher concentration of academic rheumatology programs at UTHealth and Baylor. Phoenix's count reflects NPI records filed under the city of Phoenix specifically — a radius search including Scottsdale, Tempe, and Mesa would return more. For Phoenix territory planning, use a radius search rather than a city-name filter.

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=Rheumatology 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: Rheumatologist → 0 results; Arthritis → 0 results. Pediatric Rheumatology returned 200+ nationally.

Raw responses: npi-rheumatology-memphis-tn-raw.json, npi-rheumatology-wyoming-raw.json. Collection script: _data/npi-counts-rheumatology.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 neurologists by zip code — another specialty with important taxonomy string traps.
How to find endocrinologists by zip code — similarly sparse in rural markets, with its own taxonomy quirks.