David Dayan-rosenman, M.D.
David Dayan-rosenman, M.D. is an Addiction Medicine (Internal Medicine) Physician in Brooklyn, NY, registered under NPI 1992083885. This provider registers 2 separate taxonomy codes, which usually means they practise across more than one recognised specialty. NPPES records them as a sole proprietor, meaning the practice is not incorporated as a separate legal entity.
Getting there
The practice address on file is 495 FLATBUSH AVE # C5, Brooklyn, NY 11225. 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 |
|---|---|---|
| 272914 | NY | Addiction Medicine (Internal Medicine)… primary |
| 272914 | NY | Internal Medicine Physician |
This provider holds licence 272914 issued in NY. A licence number in NPPES reflects what was filed at registration — it does not confirm the licence is still active today.
- Status
- Approved
- Provider type
- Practitioner - Internal Medicine
- PAC ID
- 4385940113
Enrolled in Medicare 7 times, across 7 states:
| State | Enrollment ID | Provider type |
|---|---|---|
| New York | I20160304000307 | Practitioner - Internal Medicine |
| North Carolina | I20220627003467 | Practitioner - Internal Medicine |
| Massachusetts | I20220628002111 | Practitioner - Internal Medicine |
| Ohio | I20220915003143 | Practitioner - Internal Medicine |
| Indiana | I20231215002878 | Practitioner - Internal Medicine |
| Illinois | I20240207002256 | Practitioner - Internal Medicine |
| Florida | I20240328002275 | Practitioner - Psychiatry |
Medicare enrolment is recorded as approved under the provider type Practitioner - Internal Medicine. There are 7 separate enrolment records across 7 states (NY, NC, MA, OH, IN, IL, FL). Multiple enrolments usually mean the provider bills Medicare from more than one practice location, or has kept an earlier enrolment after moving. Each record carries its own enrolment ID, listed above. 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.
What Addiction Medicine covers
An internist doctor of osteopathy that specializes in the treatment of addiction disorders. A doctor of osteopathy that is board eligible/certified by the American Osteopathic Board of Internal Medicine can obtain a Certificate of Added Qualifications in the field of Addiction Medicine. NUCC Health Care Provider Taxonomy, code 207RA0401X
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 | |
|---|---|---|---|---|
| 207RA0401X | Addiction Medicine (Internal Medicine) Physician Addiction Medicine | 272914 | NY | primary |
| 207R00000X | Internal Medicine Physician | 272914 | NY |
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 | 1992083885 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Jul 27, 2011 |
| Last updated | Mar 2, 2023 |
| Status | Active |
| Sole proprietor | Yes |
| Credential | M.D. |
| Practice address |
495 FLATBUSH AVE # C5 Brooklyn, NY 11225 (833) 904-2273 Fax (720) 815-0307 |
| Other identifiers |
04251112
· Medicaid (NY) |
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 | 9 | 9 | 2 | 0 | 8 | 3 | 8 | 8 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 9 | 9 | 2 | 0 | 8 | 6 | 8 | 7 |
Sum = 75 · next multiple of 10 = 80 · check digit = 5 · actual last digit = 5
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.