MARYLAND PROTON TREATMENT CENTER, LLC
MARYLAND PROTON TREATMENT CENTER, LLC is an organization registered with the National Plan and Provider Enumeration System (NPPES) under NPI 1255742375, based in Baltimore, MD. The organization lists 3 taxonomy classifications, with Clinic/Center recorded as primary.
Getting there
The practice address on file is 850 W BALTIMORE ST, Baltimore, MD 21201. 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 |
|---|---|---|
| MM483 | MD | Clinic/Center primary |
| MM483 | MD | Radiology Clinic/Center |
| MM483 | MD | Radiation Oncology Clinic/Center |
This provider holds licence MM483 issued in MD. 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
- Part B Supplier - Radiation Therapy Center
- PAC ID
- 5597070524
- Enrollment ID
- O20150819008188
Medicare enrolment is recorded as approved under the provider type Part B Supplier - Radiation Therapy Center. 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 Clinic/Center covers
A facility or distinct part of one used for the diagnosis and treatment of outpatients. "Clinic/Center" is irregularly defined, sometimes being limited to organizations serving specialized treatment requirements or distinct patient/client groups (e.g., radiology, poor, and public health). NUCC Health Care Provider Taxonomy, code 261Q00000X
All registered taxonomy codes
This provider registers 3 taxonomy codes. The primary code is what appears on most claims; the others record additional recognised specialties.
| Code | Specialty | Licence | State | |
|---|---|---|---|---|
| 261Q00000X | Clinic/Center | MM483 | MD | primary |
| 261QR0200X | Radiology Clinic/Center Radiology | MM483 | MD | |
| 261QX0203X | Radiation Oncology Clinic/Center Oncology, Radiation | MM483 | MD |
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-2 identifies an organization — a clinic, hospital, group practice, laboratory, or supplier. Individual clinicians working there hold their own NPI-1 numbers separately, so a bill may reference both.
| NPI | 1255742375 valid check digit |
|---|---|
| Entity type | Organization (NPI-2) |
| Enumeration date | May 12, 2014 |
| Last updated | Mar 10, 2025 |
| Status | Active |
| Practice address |
850 W BALTIMORE ST Baltimore, MD 21201 (410) 369-5200 Fax (410) 347-0870 |
| Mailing address |
PO BOX 65034 Baltimore, MD 21264 |
| Other names |
Maryland Proton Treatment Center Former Legal Name |
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 | 2 | 5 | 5 | 7 | 4 | 2 | 3 | 7 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 2 | 1 | 5 | 5 | 4 | 4 | 3 | 5 |
Sum = 55 · next multiple of 10 = 60 · 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.