Caleb Chan, M.D.
Caleb Chan, M.D. is a Critical Care Medicine (Internal Medicine) Physician in Baltimore, MD, registered under NPI 1750776381. This provider registers 4 separate taxonomy codes, which usually means they practise across more than one recognised specialty.
Getting there
The practice address on file is 22 S GREENE 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 |
|---|---|---|
| D91349 | MD | Critical Care Medicine (Internal… primary |
| D91349 | MD | Internal Medicine Physician |
| D91349 | MD | Pulmonary Disease Physician |
This provider holds licence D91349 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
- Practitioner - Critical Care (intensivists)
- PAC ID
- 8921346131
Medicare enrolment is recorded as approved under the provider type Practitioner - Critical Care (intensivists). This means the provider is enrolled to bill Medicare, though it does not tell you whether they are currently accepting new Medicare patients. Call the office to confirm.
What Critical Care Medicine covers
An internist who diagnoses, treats and supports patients with multiple organ dysfunction. This specialist may have administrative responsibilities for intensive care units and may also facilitate and coordinate patient care among the primary physician, the critical care staff and other specialists. NUCC Health Care Provider Taxonomy, code 207RC0200X
All registered taxonomy codes
This provider registers 4 taxonomy codes. The primary code is what appears on most claims; the others record additional recognised specialties.
| Code | Specialty | Licence | State | |
|---|---|---|---|---|
| 207RC0200X | Critical Care Medicine (Internal Medicine) Physician Critical Care Medicine | D91349 | MD | primary |
| 390200000X | Student in an Organized Health Care Education/Training Program | — | — | |
| 207R00000X | Internal Medicine Physician | D91349 | MD | |
| 207RP1001X | Pulmonary Disease Physician Pulmonary Disease | D91349 | 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-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 | 1750776381 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Mar 31, 2015 |
| Last updated | Sep 3, 2021 |
| Status | Active |
| Sole proprietor | No |
| Credential | M.D. |
| Practice address |
22 S GREENE ST Baltimore, MD 21201 (410) 328-8141 Fax (410) 328-0177 |
| Mailing address |
PO BOX 64442 Baltimore, MD 21264 |
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 | 5 | 0 | 7 | 7 | 6 | 3 | 8 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 7 | 1 | 0 | 5 | 7 | 3 | 3 | 7 |
Sum = 59 · next multiple of 10 = 60 · 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.