Brian S. Fassel, DO
Anesthesiology Physician · Denver, CO
Brian S. Fassel, DO is an anesthesiology physician with a practice address in Denver, Colorado, and NPI 1538145941, issued on Dec 16, 2005. Check the license (Colorado 40574, as entered in NPPES) on the Colorado Medical Board; the Medicare figures below come from public CMS files.
- Name
- Brian S. Fassel
- Credential
- DO
- Primary taxonomy
- Anesthesiology Physician 207L00000X
- License number
- 40574 CO
Self-reported in NPPES; status is on the state search - Practice location
- 455 Sherman, Denver, CO 80203
- Phone
- (303) 377-6825
- Enumerated
- Dec 16, 2005
- Record last updated
- Apr 18, 2013 (not updated in 13 years: call before relying on the address or phone)
- Fax
- (303) 780-0787
- Medicaid IDs
- 0594259 IA
100426080A KS
7713400 SD
117502500 WY - Entity
- Type 1 · individual
8 nearest anesthesiology physician records → All 1,202 in Colorado → Look up another NPI →
Also registered at 455 Sherman
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Barbara Allen, MDAnesthesiology Physician1285610246
- Ross Appleyard, MDAnesthesiology Physician1023094430
- Herbert Chado, MDAnesthesiology Physician1740266154
- David Christopher, MDAnesthesiology Physician1285610238
- Teruel Decampo, MDAnesthesiology Physician1558347963
- Levi Dieruf, MDAnesthesiology Physician1184770786
Verify Brian S. Fassel in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersColorado Medical Board
Search for license 40574Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
97% fewer Medicare Part D claims than the average anesthesiology physician in 2024
12 Medicare Part D claims, against an average of 402 among the 4,319 providers of this specialty who prescribed in Part D.
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Brian S. Fassel among 1,202 anesthesiology physician records in Colorado
Brian S. Fassel, DO is one of 1,202 anesthesiology physician records with a practice address in Colorado. 75% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 87% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileNo · 69% of these records are
- Record last updated2013 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207L00000X and a Colorado practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Anesthesiology Physician providers in Colorado
There are 1,202 anesthesiology physician records in Colorado.
All 1,202 in Colorado → Every provider in Denver → Anesthesiology Physician nationwide →
The 8 anesthesiology physician records with the nearest ZIP codes
- Barbara Allen, MDDenver, CO 802031285610246
- Ross Appleyard, MDDenver, CO 802031023094430
- Herbert Chado, MDDenver, CO 802031740266154
- David Christopher, MDDenver, CO 802031285610238
- Erika Daniel, MDDenver, CO 802031821074238
- Teruel Decampo, MDDenver, CO 802031558347963
- Douglas Dillon, MDDenver, CO 802031467438879
- Ronald Edgar, MDDenver, CO 802031366428773
Common questions
What is Brian S. Fassel, DO's NPI number?
Brian S. Fassel, DO's National Provider Identifier (NPI) is 1538145941, issued on Dec 16, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Brian S. Fassel, DO located?
The NPPES record lists a practice address at 455 Sherman, Denver, CO, 80203. Phone: (303) 377-6825. Providers update this record themselves, so call before visiting.
How can I verify Brian S. Fassel, DO's license?
NPPES lists Colorado license number 40574, as entered by the provider. Search the Colorado Medical Board at https://dpo.colorado.gov/Medical. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Brian S. Fassel, DO prescribe under Medicare Part D?
In 2024, Brian S. Fassel, DO had 12 Medicare Part D claims; the average among anesthesiology physician prescribers was 402. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.