How to Find Endocrinologists by Zip Code
Data sourced from live CMS NPI Registry API v2.1 queries, run June 12, 2026. All provider counts are real API responses. Raw query results are available for download. See methodology below.
taxonomy_description=Endocrinology%2C+Diabetes+%26+Metabolism — or the short form Endocrinology, which returns identical results. Both are valid. The term "Diabetologist" returns zero results: there is no such taxonomy code in CMS NPI, and no partial match. This guide documents real provider counts from 9 markets (Wyoming: 17 statewide, Vermont: 30), why endocrinology is one of the lowest-density specialties in the registry, and how to structure a territory plan when provider counts are genuinely thin.
Diabetologist taxonomy code in the CMS NPI system — confirmed June 12, 2026. Zero results. Physicians managing diabetes professionally are registered under Endocrinology, Diabetes & Metabolism. Also confirmed: the short form taxonomy_description=Endocrinology returns the same 68 Memphis records as the full string. Either works.
Endocrinology in the NPI registry: real counts from 9 markets
Endocrinology is a sparse specialty by NPI density. We queried the CMS NPI API v2.1 on June 12, 2026. Even Phoenix (82) and Nashville (100) fell well below the 200-record cap — only the four largest metros hit it.
| 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 | 82 | No (complete) |
| Nashville, TN | City filter | 100 | No (complete) |
| Memphis, TN | City filter | 68 | No (complete) |
| Vermont (statewide) | State filter | 30 | No (complete) |
| Wyoming (statewide) | State filter | 17 | No (complete) |
Source: CMS NPI Registry API v2.1, taxonomy_description=Endocrinology%2C+Diabetes+%26+Metabolism, limit=200. Queried June 12, 2026.
Taxonomy structure for endocrinology
| Specialty | taxonomy_description value | NUCC code | Notes |
|---|---|---|---|
| Adult endocrinologist | Endocrinology, Diabetes & Metabolism |
207RE0101X | Short form "Endocrinology" returns identical records |
| Pediatric endocrinologist | Pediatric Endocrinology |
2080P0202X | Under Pediatrics taxonomy tree — separate query required |
| "Diabetologist" | Does not exist | None | Returns 0 results — diabetes physicians file under Endocrinology, Diabetes & Metabolism |
How to search for endocrinologists 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 endocrinologists by ZIP →
Use the correct taxonomy string
Either taxonomy_description=Endocrinology%2C+Diabetes+%26+Metabolism or the
short form taxonomy_description=Endocrinology — both return the same records.
"Diabetologist" returns zero results. The numeric NUCC code 207RE0101X is
silently ignored.
Set a wider radius — endocrinology is genuinely sparse
Recommended starting radii:
- Dense urban (NYC, Chicago, LA): 10–20 miles
- Mid-metro (Memphis, Nashville, Phoenix): 50 miles
- Rural (Wyoming, Vermont): Plan by total count, not radius. Wyoming has 17 statewide — list and route all of them.
Add Pediatric Endocrinology if your product serves pediatric patients
Tennessee statewide returned 65 Pediatric Endocrinology records in June 2026 — nearly
equal to the 68 adult endocrinology records in Memphis alone. If your territory includes
pediatric diabetes devices or growth hormone therapies, run
Pediatric+Endocrinology as a separate query and merge the two lists.
Export to CSV (Pro) — full territory capture is realistic here
In sparse endocrinology markets, most territories fit well under the 200-record cap. Pro users get a complete, unsampled export of every provider in their radius. Column headers: NPI, Name, Credential, Address, City, State, Zip, Phone, Entity Type. BOM included for Excel.
Direct API queries
# Endocrinologists in Memphis, TN — returned 68 records (June 2026) https://npiregistry.cms.hhs.gov/api/? version=2.1 &taxonomy_description=Endocrinology%2C+Diabetes+%26+Metabolism &city=Memphis &state=TN &limit=200 # Short form — returns identical results to the full string above https://npiregistry.cms.hhs.gov/api/? version=2.1 &taxonomy_description=Endocrinology &city=Memphis &state=TN &limit=200 # FAILS — "Diabetologist" is not a valid taxonomy_description; returns 0 https://npiregistry.cms.hhs.gov/api/? version=2.1 &taxonomy_description=Diabetologist &city=Memphis &state=TN &limit=200 # Pediatric endocrinologists — separate taxonomy tree, separate query https://npiregistry.cms.hhs.gov/api/? version=2.1 &taxonomy_description=Pediatric+Endocrinology &state=TN &limit=200
Radius guidance for endocrinologist territories
| Market type | Recommended starting radius | Rationale |
|---|---|---|
| Dense urban (NYC, Chicago, LA) | 10–20 miles | Large metros hit the 200-record cap even for this sparse specialty; tighter radius reduces the list to a manageable call plan |
| Mid-metro (Memphis, Nashville, Phoenix) | 50 miles | Memphis returned 68 city records; 50-mile radius adds regional providers without over-reaching into adjacent territory |
| Rural / sparse (Wyoming, Vermont) | Plan by total count | Wyoming: 17 statewide. A radius search adds little value when total count equals your entire account list. Map all providers and route them. |
getdork handles the correct taxonomy string, the radius math, and the deduplication. In sparse markets you get a complete count — not a sampled result. Free to preview; Pro for the full list and CRM-ready CSV.
Search endocrinologists by ZIP code — free →
Frequently asked questions
Is there a "Diabetologist" taxonomy code in the CMS NPI registry?
No. Confirmed by live API query June 12, 2026 — zero results returned. Physicians who specialize
in diabetes management are registered under Endocrinology, Diabetes & Metabolism.
Any call list tool that queries "Diabetologist" as a taxonomy filter is silently returning nothing.
Why does endocrinology return fewer records per market than cardiology or orthopedics?
There are roughly 7,500 practicing endocrinologists in the U.S. compared to over 25,000 cardiologists. Endocrinology patients are managed long-term by the same provider rather than episodically — the specialty does not need the same geographic density. Wyoming's 17 statewide is not a data gap; it reflects real provider supply. Territory reps in this specialty routinely cover larger geographies with longer drives between accounts.
Does the endocrinology NPI dataset include thyroid specialists separately?
No separate thyroid taxonomy exists. Thyroid-focused endocrinologists file under
Endocrinology, Diabetes & Metabolism. The registry does not differentiate
clinical focus within the specialty. For thyroid cancer drugs or radioiodine therapies, start
with the endocrinology taxonomy and supplement with academic medical center directories to
identify thyroid-focused practices.
How is Pediatric Endocrinology different from adult Endocrinology in NPI data?
Pediatric Endocrinology is a completely separate NUCC taxonomy under the Pediatrics specialty
tree — not a subspecialty of adult Endocrinology. Tennessee statewide returned 65 Pediatric
Endocrinology records in June 2026. An adult endocrinology query will not return pediatric
endocrinologists unless they also filed the adult taxonomy. Reps covering pediatric diabetes
devices or growth hormone therapies need the Pediatric+Endocrinology query separately.
What radius is appropriate for an endocrinologist territory in a rural state?
Wyoming returned 17 statewide in June 2026. At that density, radius is the wrong tool — plan around total provider count instead. Map all 17 by city and design a travel route. Vermont's 30 statewide providers allow a similar approach. Radius search is most valuable when there are enough providers to require geographic filtering.
What pharma and device products use an endocrinologist call list?
GLP-1 receptor agonists (semaglutide, tirzepatide), SGLT-2 inhibitors, insulin analogs, thyroid hormone replacement brands, osteoporosis biologics (denosumab, romosozumab), continuous glucose monitoring systems, insulin pumps, DEXA bone density systems, and HbA1c/thyroid function laboratory diagnostics.
Data methodology
All provider counts come from direct queries to the CMS NPI Registry API v2.1, run on
June 12, 2026. We used taxonomy_description=Endocrinology%2C+Diabetes+%26+Metabolism
and limit=200. No authentication required.
When result_count equals 200 the actual total exceeds 200 and is unknown from this endpoint. Counts below 200 are exact totals.
Raw responses: npi-endocrinology-memphis-tn-raw.json, npi-endocrinology-wyoming-raw.json. Collection script: _data/npi-counts-endocrinology.ps1.
Related guides
- How to search the NPI registry (full guide) — complete API reference and the taxonomy_description quirk explained.
- 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 pulmonologists by zip code — another Internal Medicine subspecialty with a naming gotcha.
- How to find orthopedic surgeons by zip code — British spelling gotcha and rich subspecialty taxonomy structure.