Mark Brunvand, MD
Mark Brunvand, MD is a Hematology & Oncology Physician in Denver, CO, registered under NPI 1891779534.
Getting there
The practice address on file is 1721 E 19TH AVE STE 300, Denver, CO 80218. 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 |
|---|---|---|
| 26243 | CO | Hematology & Oncology Physician primary |
This provider holds licence 26243 issued in CO. A licence number in NPPES reflects what was filed at registration — it does not confirm the licence is still active today.
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.
What Hematology & Oncology covers
An internist doctor of osteopathy that specializes in the treatment of the combination of hematology and oncology disorders. A doctor of osteopathy that is board eligible/certified by the American Osteopathic Board of Internal Medicine WAS able to obtain a Certificate of Special Qualifications in the field of Hematology and Oncology. The Certificate is NO longer offered. NUCC Health Care Provider Taxonomy, code 207RH0003X
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 | 1891779534 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Dec 6, 2005 |
| Last updated | Feb 7, 2014 |
| Status | Active |
| Sole proprietor | No |
| Credential | MD |
| Practice address |
1721 E 19TH AVE STE 300 Denver, CO 80218 (720) 754-4800 Fax (720) 754-4801 |
| Mailing address |
4900 S MONACO ST SUITE 210 Denver, CO 80237 |
| Other identifiers |
117831800
(WY) 1891779534 (WY) 200604790B (KS) 200604791B (KS) 37709003 (NM) 01026244 (CO) 10025893500 (NE) |
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 | 8 | 9 | 1 | 7 | 7 | 9 | 5 | 3 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 8 | 9 | 1 | 5 | 7 | 9 | 5 | 6 |
Sum = 76 · next multiple of 10 = 80 · check digit = 4 · actual last digit = 4
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.