Jan Ryszkowski, M.D.
Jan Ryszkowski, M.D. is a Nuclear Medicine Physician in Little Rock, AR, registered under NPI 1134304512. This provider registers 5 separate taxonomy codes, which usually means they practise across more than one recognised specialty.
Getting there
The practice address on file is 316 COMMENTRY WAY, Little Rock, AR 72223. 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 |
|---|---|---|
| 4301091356 | MI | Nuclear Imaging & Therapy Physician |
| 4301091356 | MI | Nuclear Cardiology Physician |
| 4301091356 | MI | In Vivo & In Vitro Nuclear Medicine… |
| E-5892 | AR | Nuclear Medicine Physician primary |
| 4301091356 | MI | Nuclear Medicine Physician |
| 4301091356 | MI | General Practice Physician |
Licences are recorded in 2 states: MI, AR. Providers licensed in several states often practise near a state border or deliver telehealth across state lines.
- Status
- Approved
- Provider type
- Practitioner - Nuclear Medicine
- PAC ID
- 3577622604
- Enrollment ID
- I20081104000806
Medicare enrolment is recorded as approved under the provider type Practitioner - Nuclear Medicine. 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: Arkansas and Michigan. The practice address on file is in Little Rock, AR, 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
- E-5892
- Specialty
- Nuclear Medicine Physician
- Licence
- 4301091356
- Specialty
- Nuclear Imaging & Therapy 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 Nuclear Medicine covers
A nuclear medicine specialist employs the properties of radioactive atoms and molecules in the diagnosis and treatment of disease and in research. Radiation detection and imaging instrument systems are used to detect disease as it changes the function and metabolism of normal cells, tissues and organs. A wide variety of diseases can be found in this way, usually before the structure of the organ involved by the disease can be seen to be abnormal by any other techniques. Early detection of coronary artery disease (including acute heart attack), early cancer detection and evaluation of the effect of tumor treatment, diagnosis of infection and inflammation anywhere in the body and early detection of blood clot in the lungs are all possible with these techniques. Unique forms of radioactive molecules can attack and kill cancer cells (e.g., lymphoma, thyroid cancer) or can relieve the severe pain of cancer that has spread to bone NUCC Health Care Provider Taxonomy, code 207U00000X
All registered taxonomy codes
This provider registers 6 taxonomy codes. The primary code is what appears on most claims; the others record additional recognised specialties.
| Code | Specialty | Licence | State | |
|---|---|---|---|---|
| 207UN0902X | Nuclear Imaging & Therapy Physician Nuclear Imaging & Therapy | 4301091356 | MI | |
| 207UN0901X | Nuclear Cardiology Physician Nuclear Cardiology | 4301091356 | MI | |
| 207UN0903X | In Vivo & In Vitro Nuclear Medicine Physician In Vivo & In Vitro Nuclear Medicine | 4301091356 | MI | |
| 207U00000X | Nuclear Medicine Physician | E-5892 | AR | primary |
| 207U00000X | Nuclear Medicine Physician | 4301091356 | MI | |
| 208D00000X | General Practice Physician | 4301091356 | MI |
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 | 1134304512 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Jan 4, 2008 |
| Last updated | Sep 19, 2025 |
| Status | Active |
| Sole proprietor | No |
| Gender | Male |
| Credential | M.D. |
| Practice address |
316 COMMENTRY WAY Little Rock, AR 72223 (501) 352-7043 |
| Other identifiers |
174688001
· Medicaid (AR) |
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 | 1 | 3 | 4 | 3 | 0 | 4 | 5 | 1 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 1 | 6 | 4 | 6 | 0 | 8 | 5 | 2 |
Sum = 58 · next multiple of 10 = 60 · check digit = 2 · actual last digit = 2
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.