Dan Douer, M.D.
Dan Douer, M.D. is a Hematology (Internal Medicine) Physician in New York, NY, registered under NPI 1700825171.
Getting there
The practice address on file is 1275 YORK AVE, New York, NY 10065. We have not yet mapped what surrounds this office — parking, transit, and nearby pharmacies are added as our data collection reaches each location.
Credentials and Medicare
| Licence | State | Specialty |
|---|---|---|
| 261841 | NY | Hematology (Internal Medicine) Physician primary |
| A36194 | CA | Hematology (Internal Medicine) Physician |
Licences are recorded in 2 states: NY, CA. Providers licensed in several states often practise near a state border or deliver telehealth across state lines.
- Status
- Approved
- Provider type
- Order And Referring Only - Hematology
- PAC ID
- 8921010844
- Enrollment ID
- I20250206003564
Medicare enrolment is recorded as approved under the provider type Order And Referring Only - Hematology. Being enrolled means the provider can bill Medicare; it does not tell you whether they are currently accepting new Medicare patients. Call the office to confirm.
Licensed in 2 states
This provider holds licences in 2 states: California and New York. The practice address on file is in New York, NY, but a licence in another state usually means they see patients there too — either at a second location or by telehealth. If the address above is far from you, it is worth calling to ask whether they practise closer to where you live.
- Licence
- A36194
- Specialty
- Hematology (Internal Medicine) Physician
- Licence
- 261841
- Specialty
- Hematology (Internal Medicine) Physician
Licence numbers are self-reported to NPPES at registration. They do not confirm a licence is currently active, in good standing, or valid for the specialty shown — only the state board can tell you that, which is why we link to each one.
What Hematology covers
An internist with additional training who specializes in diseases of the blood, spleen and lymph. This specialist treats conditions such as anemia, clotting disorders, sickle cell disease, hemophilia, leukemia and lymphoma. NUCC Health Care Provider Taxonomy, code 207RH0000X
All registered taxonomy codes
This provider registers 2 taxonomy codes. The primary code is what appears on most claims; the others record additional recognised specialties.
| Code | Specialty | Licence | State | |
|---|---|---|---|---|
| 207RH0000X | Hematology (Internal Medicine) Physician Hematology | 261841 | NY | primary |
| 207RH0000X | Hematology (Internal Medicine) Physician Hematology | A36194 | CA |
The taxonomy records how the provider classifies their own practice. It does not confirm which conditions they currently treat, whether they are accepting new patients, or which insurance they take — call the office for that.
Full NPPES record
An NPI-1 identifies a single person. It stays with the clinician for life, even if they move practice or change state, which is why the address on file can lag behind where they actually work today.
| NPI | 1700825171 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Jun 4, 2006 |
| Last updated | Aug 4, 2011 |
| Status | Active |
| Sole proprietor | No |
| Credential | M.D. |
| Practice address |
1275 YORK AVE New York, NY 10065 (212) 639-2471 |
| Mailing address |
633 3RD AVE BOX 3 New York, NY 10017 |
| Other identifiers |
GROO16910
· Other (CA) W11675 · Other (CA) 110065232 · Other (CA) 1356390009 · Other (CA) 00A361940 · Other (CA) CE1617 · Other (CA) 00A361940 · Medicaid (CA) |
Number check
How the check works, step by step
Every NPI carries a Luhn check digit — the same scheme used on credit cards. CMS prefixes the number with 80840 before computing it, which marks it as a US health identifier.
| Digit | 8 | 0 | 8 | 4 | 0 | 1 | 7 | 0 | 0 | 8 | 2 | 5 | 1 | 7 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 7 | 0 | 0 | 7 | 2 | 1 | 1 | 5 |
Sum = 49 · next multiple of 10 = 50 · check digit = 1 · actual last digit = 1
A valid check digit only means the number is well-formed. It does not mean the provider is licensed, active, or in good standing — those are separate questions answered by the sections above.