US physician practices from the CMS NPPES register: fields, method and prices, nationwide or by state.
Oncologist email list
The CMS NPPES register (file of 2026-09-14) lists ~17,000 registered practice addresses where at least one provider carries an oncology code: hematology and oncology, medical oncology, radiation oncology, surgical oncology, gynecologic oncology or pediatric hematology-oncology. That is 3.5% of the ~483,000 physician addresses in the same file. Treat it as an upper bound. The register keeps closed and duplicate addresses, and an oncologist who works at several sites can be registered at each one. The oncologist list holds one row per oncology office we can confirm, with the email it publishes and the page where we found it. You can order it now, nationwide or by state.
What's in the list
| Column | What it holds | Format |
|---|---|---|
| practice_name, dba | Legal and trading names | text |
| address, city, state, zip, county | Practice location | text; state as 2 letters, ZIP as 5 digits |
| phone | Main number the practice publishes | text |
| website | The practice's own site, or the group's page for that location | URL |
| email, email_type | An email the practice publishes on its own site, marked role (info@, frontdesk@) or personal (a named inbox at the practice's own domain). No free-mail addresses | email address; type is role or personal |
| email_status | valid, catch-all or unknown. Catch-all means the mailbox can't be confirmed; invalid emails are removed | valid, catch-all or unknown |
| email_source_url | The page or official register where the email was published | URL |
| email_last_verified | Date of the latest verification check | date, ISO 8601 (year-month-day) |
| specialty | The specialties registered at the address, from the NUCC taxonomy (family medicine, cardiology, dermatology and so on) | one of a fixed list of specialties (NUCC taxonomy) |
| physicians_at_location | Number of physicians with an active NPI at this address | whole number |
| group_affiliation | Health system or medical group name where public evidence shows one (blank when unknown) | text; blank when unknown |
| npi, source_last_updated | The practice's NPI and when NPPES last changed the record | 10-digit NPI; date, ISO 8601 (year-month-day) |
In the public register
Registered practice addresses in the register~17,000
Rounded count in CMS NPPES, file of 2026-09-14. It is an upper bound: registers keep closed and duplicate entries, which our checks remove.
States and DC51
States plus DC with at least one entry in the register.
Register file date2026-09-14
The date of the public file we counted.
Who is included
An office is in this list when a provider registered at its address carries one of seven NUCC taxonomy codes, in any of the 15 taxonomy slots of an NPPES record.
Hematology on its own (207RH0000X) is left out, so a clinic that registers only benign hematology is not in this list. Radiation oncology is counted here and not in the radiologist email list. Oncology nurses, nurse practitioners and physician assistants count only where an oncologist is registered at the same address. Two codes also belong to other groups. Pediatric hematology-oncology sits in the pediatrician email list too, and surgical oncologists are also surgeons, so this count overlaps with the surgeon count. Never add these counts together. All other specialties are in the physician email list.
Physician email listHow many oncologists are in the US?
ASCO counted 14,547 hematologists and medical oncologists in 2024, up from 12,267 in 2014 (JCO Oncology Practice, October 2025). The study counted physicians billing Medicare whose primary specialty is hematology, medical oncology or hematology/oncology, plus internists with one of those as a secondary specialty. Radiation, surgical, gynecologic and pediatric oncologists are outside that figure, and benign hematologists are inside it, so it measures a different group from this list. The Bureau of Labor Statistics has no oncologist occupation. Its 2018 occupation codes file oncologists under "Physicians, All Other" (29-1229) and gynecologic oncologists under obstetricians and gynecologists (29-1218), so no BLS job count matches.
In the NPPES register, ~35,000 individual NPIs have one of the seven oncology codes as their primary taxonomy. ~38,000 carry one in any slot, which is an upper bound, because physicians keep their NPI after they retire.
| Term | What it counts | Latest figure | Source and date |
|---|---|---|---|
| Hematologists and medical oncologists | Physicians billing Medicare with hematology, medical oncology or hematology/oncology as primary specialty, or as secondary specialty to internal medicine | 14,547 | ASCO, JCO Oncology Practice, data year 2024 (published October 2025) |
| Primary-taxonomy oncology NPIs | Individual NPIs whose primary taxonomy is one of the seven codes above, including radiation, surgical, gynecologic and pediatric oncology | ~35,000 | CMS NPPES, file of 2026-09-14 |
| Any-slot oncology NPIs | Individual NPIs with one of the seven codes in any slot; an upper bound | ~38,000 | CMS NPPES, file of 2026-09-14 |
| Registered oncology addresses | Distinct practice addresses where an active NPI carries one of the codes | ~17,000 | CMS NPPES, file of 2026-09-14 |
Counts are rounded.
Oncology addresses by state
California has the most registered oncology addresses, followed by New York, Florida and Texas. Those four hold about 35% of the US total. Wyoming, Vermont, North Dakota and South Dakota have the fewest.
| State | In the public register | Per 100,000 residents | Share of US total |
|---|---|---|---|
| California | ~1,900 | 4.9 | 11% |
| New York | ~1,400 | 7.2 | 8.5% |
| Florida | ~1,400 | 6.1 | 8.4% |
| Texas | ~1,200 | 3.7 | 6.9% |
| Pennsylvania | ~770 | 5.9 | 4.5% |
| Illinois | ~660 | 5.2 | 3.9% |
| Maryland | ~610 | 9.8 | 3.6% |
| New Jersey | ~580 | 6.1 | 3.4% |
| Ohio | ~570 | 4.7 | 3.3% |
| North Carolina | ~540 | 4.8 | 3.2% |
| Georgia | ~500 | 4.4 | 2.9% |
| Michigan | ~490 | 4.8 | 2.9% |
| Massachusetts | ~420 | 5.8 | 2.5% |
| Tennessee | ~410 | 5.6 | 2.4% |
| Virginia | ~390 | 4.3 | 2.3% |
| Indiana | ~360 | 5.1 | 2.1% |
| Arizona | ~350 | 4.6 | 2% |
| Colorado | ~330 | 5.5 | 2% |
| Washington | ~320 | 4.0 | 1.9% |
| Connecticut | ~250 | 6.7 | 1.5% |
| Missouri | ~250 | 3.9 | 1.4% |
| Louisiana | ~230 | 5.0 | 1.4% |
| Wisconsin | ~230 | 3.8 | 1.3% |
| Kentucky | ~220 | 4.8 | 1.3% |
| South Carolina | ~220 | 3.9 | 1.3% |
| Alabama | ~210 | 4.1 | 1.3% |
| Minnesota | ~200 | 3.4 | 1.2% |
| Oregon | ~170 | 4.1 | 1% |
| Oklahoma | ~150 | 3.7 | 0.9% |
| Kansas | ~140 | 4.8 | 0.84% |
| Nevada | ~140 | 4.3 | 0.83% |
| Utah | ~140 | 3.9 | 0.82% |
| Arkansas | ~140 | 4.4 | 0.81% |
| Iowa | ~110 | 3.3 | 0.63% |
| Mississippi | ~100 | 3.4 | 0.58% |
| New Mexico | ~90 | 4.2 | 0.53% |
| West Virginia | ~90 | 5.0 | 0.52% |
| Nebraska | ~80 | 4.0 | 0.47% |
| District of Columbia | ~70 | 10.4 | 0.42% |
| Rhode Island | ~70 | 6.2 | 0.4% |
| Maine | ~70 | 4.7 | 0.39% |
| Hawaii | ~60 | 4.0 | 0.34% |
| New Hampshire | ~60 | 4.1 | 0.34% |
| Idaho | ~50 | 2.7 | 0.32% |
| Montana | ~50 | 4.2 | 0.28% |
| Alaska | ~50 | 6.2 | 0.27% |
| Delaware | ~50 | 4.2 | 0.26% |
| South Dakota | ~40 | 4.2 | 0.23% |
| North Dakota | ~40 | 4.5 | 0.21% |
| Vermont | ~30 | 4.3 | 0.16% |
| Wyoming | ~20 | 3.4 | 0.12% |
Counts are rounded.
These are register counts, rounded. The list will hold fewer rows, because our checks remove closed and duplicate entries.
Where oncology addresses are dense and where they are thin
Across the US there are about 5.0 oncology addresses per 100,000 residents. The District of Columbia (10.4) and Maryland (9.8) have about twice that rate, and New York (7.2) and Connecticut (6.7) come next. Idaho has the lowest rate at 2.7, then Iowa (3.3). Texas is fourth by count, yet at 3.7 per 100,000 it sits well below the national rate.
| State | Per 100,000 residents | In the public register |
|---|---|---|
| District of Columbia | 10.4 | ~70 |
| Maryland | 9.8 | ~610 |
| New York | 7.2 | ~1,400 |
| Connecticut | 6.7 | ~250 |
| Alaska | 6.2 | ~50 |
| Rhode Island | 6.2 | ~70 |
| Florida | 6.1 | ~1,400 |
| New Jersey | 6.1 | ~580 |
| Pennsylvania | 5.9 | ~770 |
| Massachusetts | 5.8 | ~420 |
Counts are rounded.
The ASCO study found the same unevenness at county level. About 11% of adults aged 55 and over lived in the 55% of US counties that had no hematologist or medical oncologist in 2024, and 68% of the population lived in counties where more than a quarter of oncologists were nearing retirement age. For a sales team covering a rural state, the register count is small and the offices are spread thin.
Oncology's share of each state's physician addresses runs from about 2.3% in Idaho and Wyoming to 5.3% in North Dakota, against 3.5% nationally. Maryland (4.9%) and Rhode Island (4.7%) follow North Dakota. Shares are computed from the oncology and physician register counts for each state, from the CMS file of 2026-09-14.
Free sample
Leave your email. Our first email asks you to confirm your address, then we send you 25 rows from this list, usually within one business day.
How delivery works
Checkout
You choose nationwide or your states and pay by card. Your card is held, not charged.
Update and verify
We update your list from the latest public sources and verify its emails, so you receive a fresh list.
Checks
We remove everyone on our suppression list and check the file before it goes out.
Email
We email you your files. Delivered within 24 hours, usually much sooner. That includes the nationwide file.
Payment
Your card is charged when the file is delivered. If we can't deliver in time, we cancel the hold and you pay nothing.
Where the data comes from
The list starts from the CMS National Plan and Provider Enumeration System (NPPES), the federal register of healthcare providers, file of 2026-09-14. We group MD and DO registrations by practice address, match each location to its own website or its group's location page, and record the emails and phone numbers published there, with the page URL. We check each email with the receiving mail server and leave out locations we can't confirm as current.
Full methodologyCMS NPPES
Questions about the oncologist list
Can I buy the oncologist list now?
Yes. Choose nationwide or up to 10 states in the order panel on this page. It costs $249 nationwide, and the panel shows the price of each state file. Delivered within 24 hours, usually much sooner. That includes the nationwide file.
Does the list include hospital-employed oncologists?
Rows will be locations, not people. An oncologist employed by a hospital or cancer center will appear through the clinic or infusion site where they treat patients, with that site's name, phone and published email. The list will name no oncologists.
Could infusion and specialty pharmacy suppliers use this list?
Probably, if they sell to the clinic rather than the hospital. Infusion suppliers, specialty pharmacies and oncology software vendors need the sites where medical oncologists treat patients, and the specialty column will let them drop radiation-only centers. We have not tested that use with buyers yet.
Are radiation oncologists included?
Yes. Radiation oncology (2085R0001X) and therapeutic radiology (2085R0203X) are in this list. They are not counted as radiologists.
Why is benign hematology left out?
Code 207RH0000X is hematology without the oncology designation. A hematologist registered only under it may treat anemia and clotting disorders, blood cancers or both, and the code doesn't say which. We leave it out to keep the list to offices that register an oncology code. Hematology-oncology (207RH0003X) is included.
Sources
- CMS, NPPES Data Dissemination V.2, file of 2026-09-14, taxonomy codes 207RH0003X, 207RX0202X, 2085R0001X, 2085R0203X, 2086X0206X, 207VX0201X and 2080P0207X, https://download.cms.gov/nppes/NPI_Files.html (accessed 2026-10-04)
- ASCO, Where Have We Been and Where Are We Going? The State of the Hematology and Medical Oncologist Workforce in America, JCO Oncology Practice, published online 2025-10-07, https://ascopubs.org/doi/10.1200/OP-25-00144 (accessed 2026-10-04)
- BLS, 2018 SOC definitions (29-1229 Physicians, All Other; 29-1218 Obstetricians and Gynecologists), https://www.bls.gov/soc/2018/soc_2018_definitions.pdf (accessed 2026-10-04)