Brian O'Shea Ahlstrand, M.D.
Internal Medicine Physician · Westminster, CO
Brian O'Shea Ahlstrand, M.D. is an internal medicine physician with a practice address in Westminster, Colorado, and NPI 1487920690, issued on Apr 2, 2012. Check the license (Colorado 0055108, as entered in NPPES) on the Colorado Medical Board; the Medicare figures below come from public CMS files.
- Name
- Brian O'Shea Ahlstrand
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 0055108 CO
Self-reported in NPPES; status is on the state search - Practice location
- 11245 Huron St, Westminster, CO 80234
- Phone
- (303) 338-4545
- Enumerated
- Apr 2, 2012
- Record last updated
- Jun 10, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicaid ID
- 48470716 CO
- Medicare enrollment
- Enrolled (PECOS I20150917002698); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 2,046 in Colorado → Look up another NPI →
Also registered at 11245 Huron St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Maricelle AbrenaPharmacist1902234990
- Kim Adams, RNAmbulatory Care Registered Nurse1922351535
- Geraldine AmadorNurse's Aide1700913787
- Stephanie Ambach, DOObstetrics & Gynecology Physician1710555198
- Kim Anderson, KIM ANDERSON RNPediatric Registered Nurse1003147984
- Katherine Angland, FNP-BCFamily Nurse Practitioner1174964266
Verify Brian O'Shea Ahlstrand in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersColorado Medical Board
Search for license 0055108Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
4.4 times the Medicare Part D claims of the average internal medicine physician in 2024
13,825 Medicare Part D claims for 1,780 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 9% of claims. 855 claims were for opioids.
Most prescribed
- Atorvastatin Calcium976 claims
- Levothyroxine Sodium554 claims
- Lisinopril554 claims
- Amlodipine Besylate483 claims
- Rosuvastatin Calcium417 claims
- Simvastatin400 claims
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.
Bills Medicare through one group practice
- Colorado Permanente Medical Group PCWestminster, CO
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Brian O'Shea Ahlstrand among 2,046 internal medicine physician records in Colorado
Brian O'Shea Ahlstrand, M.D. is one of 2,046 internal medicine physician records with a practice address in Colorado. 71% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2012, is newer than 72% of them.
- NPI issued2012 · 72% of these records are older, 26% newer
- In a Medicare fileYes · 71% of these records are
- In the CMS Doctors and Clinicians fileYes · 53% of these records are
- Graduated2012 · median 2006 among the 1,090 with a school on file
- Record last updated2021 · 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 207R00000X and a Colorado practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
42 internal medicine physician records list a practice address in Westminster
They are 42 of the 2,492 NPPES records with a practice address in Westminster, and 2,046 internal medicine physician records in Colorado.
All 2,046 in Colorado → Every provider in Westminster → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Joanna Culver, MDWestminster, CO 802341356753511
- Emma Foraker, MDWestminster, CO 802341548766579
- James Hardee, MDWestminster, CO 802341134256720
- Gayle HutchinsonWestminster, CO 802341366572117
- John Mahoney, M.D.Westminster, CO 802341730223512
- Daniel McAninch, MDWestminster, CO 802341962539940
- Ben Mendoza, M.D.Northglenn, CO 802341285955534
- Renee Micielli, MDWestminster, CO 802341134248545
Common questions
What is Brian O'Shea Ahlstrand, M.D.'s NPI number?
Brian O'Shea Ahlstrand, M.D.'s National Provider Identifier (NPI) is 1487920690, issued on Apr 2, 2012. An NPI identifies a provider in billing; it is not a license.
Where is Brian O'Shea Ahlstrand, M.D. located?
The NPPES record lists a practice address at 11245 Huron St, Westminster, CO, 80234. Phone: (303) 338-4545. Providers update this record themselves, so call before visiting.
How can I verify Brian O'Shea Ahlstrand, M.D.'s license?
NPPES lists Colorado license number 0055108, 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 O'Shea Ahlstrand, M.D. prescribe under Medicare Part D?
In 2024, Brian O'Shea Ahlstrand, M.D. had 13,825 Medicare Part D claims for 1,780 beneficiaries; the average among internal medicine physician prescribers was 3,176. 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.