Mark Walker, M.D.
Mark Walker, M.D. is an Endocrinology, Diabetes & Metabolism Physician in Halethorpe, MD, registered under NPI 1083716823.
Getting there
The practice address on file is 1701 TWIN SPRINGS RD KAISER PERMANENTE SOUTH BALTIMORE COUNTY MEDICAL CENTER, Halethorpe, MD 21227. 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 |
|---|---|---|
| D0037239 | MD | Endocrinology, Diabetes & Metabolism… primary |
| 0101250822 | VA | Endocrinology, Diabetes & Metabolism… |
| MD039279 | DC | Endocrinology, Diabetes & Metabolism… |
Licences are recorded in 3 states: MD, VA, DC. Providers licensed in several states often practise near a state border or deliver telehealth across state lines.
This NPI does not appear in the PECOS Medicare enrolment file. Providers who do not bill Medicare — or who bill only through a group's enrolment — will not appear here. It is not a sign of any problem with the registration.
Licensed in 3 states
This provider holds licences in 3 states: District of Columbia, Maryland and Virginia. The practice address on file is in Halethorpe, MD, 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
- MD039279
- Specialty
- Endocrinology, Diabetes & Metabolism…
- Licence
- D0037239
- Specialty
- Endocrinology, Diabetes & Metabolism…
- Licence
- 0101250822
- Specialty
- Endocrinology, Diabetes & Metabolism…
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 Endocrinology, Diabetes & Metabolism covers
An internist who concentrates on disorders of the internal (endocrine) glands such as the thyroid and adrenal glands. This specialist also deals with disorders such as diabetes, metabolic and nutritional disorders, obesity, pituitary diseases and menstrual and sexual problems. NUCC Health Care Provider Taxonomy, code 207RE0101X
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 | |
|---|---|---|---|---|
| 207RE0101X | Endocrinology, Diabetes & Metabolism Physician Endocrinology, Diabetes & Metabolism | D0037239 | MD | primary |
| 207RE0101X | Endocrinology, Diabetes & Metabolism Physician Endocrinology, Diabetes & Metabolism | 0101250822 | VA | |
| 207RE0101X | Endocrinology, Diabetes & Metabolism Physician Endocrinology, Diabetes & Metabolism | MD039279 | DC |
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 | 1083716823 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Sep 2, 2006 |
| Last updated | Oct 29, 2013 |
| Status | Active |
| Sole proprietor | No |
| Credential | M.D. |
| Practice address |
1701 TWIN SPRINGS RD KAISER PERMANENTE SOUTH BALTIMORE COUNTY MEDICAL CENTER Halethorpe, MD 21227 (410) 737-5540 Fax (410) 737-5531 |
| Mailing address |
2101 E JEFFERSON ST KAISER PERMANENTE MEDICARE ENROLLMENT Rockville, MD 20852 |
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 | 0 | 8 | 3 | 7 | 1 | 6 | 8 | 2 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 7 | 3 | 5 | 1 | 3 | 8 | 4 |
Sum = 57 · next multiple of 10 = 60 · check digit = 3 · actual last digit = 3
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.