Dipak Ramkumar, M.D.
Dipak Ramkumar, M.D. is a Surgical Oncology Physician in Phoenix, AZ, registered under NPI 1639412976. This provider registers 2 separate taxonomy codes, which usually means they practise across more than one recognised specialty.
Getting there
The practice address on file is 500 W THOMAS RD STE 800, Phoenix, AZ 85013. 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 |
|---|---|---|
| 74223 | AZ | Surgical Oncology Physician primary |
| 74223 | AZ | Orthopaedic Surgery Physician |
This provider holds licence 74223 issued in AZ. 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 - Surgical Oncology
- PAC ID
- 3870890809
Enrolled in Medicare 3 times, across 3 states:
| State | Enrollment ID | Provider type |
|---|---|---|
| Massachusetts | I20190710000838 | Practitioner - Surgical Oncology |
| New Hampshire | I20220708001535 | Practitioner - Orthopedic Surgery |
| Arizona | I20241226000598 | Practitioner - Orthopedic Surgery |
Medicare enrolment is recorded as approved under the provider type Practitioner - Surgical Oncology. There are 3 separate enrolment records across 3 states (MA, NH, AZ). 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 Surgical Oncology covers
A surgical oncologist is a well-qualified surgeon who has obtained additional training and experience in the multidisciplinary approach to the prevention, diagnosis, treatment, and rehabilitation of cancer patients, and devotes a major portion of his or her professional practice to these activities and cancer research. NUCC Health Care Provider Taxonomy, code 2086X0206X
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 | |
|---|---|---|---|---|
| 2086X0206X | Surgical Oncology Physician Surgical Oncology | 74223 | AZ | primary |
| 207X00000X | Orthopaedic Surgery Physician | 74223 | AZ |
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 | 1639412976 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Apr 5, 2013 |
| Last updated | Sep 9, 2025 |
| Status | Active |
| Sole proprietor | No |
| Gender | Male |
| Credential | M.D. |
| Practice address |
500 W THOMAS RD STE 800 Phoenix, AZ 85013 (602) 406-1234 Fax (602) 406-6368 |
| Mailing address |
PO BOX 33269 Phoenix, AZ 85067 |
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 | 6 | 3 | 9 | 4 | 1 | 2 | 9 | 7 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 6 | 6 | 9 | 8 | 1 | 4 | 9 | 5 |
Sum = 74 · next multiple of 10 = 80 · check digit = 6 · actual last digit = 6
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.