Brian P. O'Sullivan
Internal Medicine Physician · Centennial, CO
Brian P. O'Sullivan is an internal medicine physician with a practice address in Centennial, Colorado, and NPI 1801926662, issued on Mar 7, 2007. Check the license (Colorado 43257, as entered in NPPES) on the Colorado Medical Board; the Medicare figures below come from public CMS files.
- Name
- Brian P. O'Sullivan
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 43257 CO
Self-reported in NPPES; status is on the state search - Practice location
- 5555 E Arapahoe RD, Centennial, CO 80122
- Phone
- (303) 338-4545
- Enumerated
- Mar 7, 2007
- Record last updated
- Jun 3, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicaid ID
- 35151811 CO
- Medicare enrollment
- Enrolled (PECOS I20050810000514); accepts Medicare assignment
- Medical or professional school
- Geisel School Of Medicine At Dartmouth, 1993
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 2,046 in Colorado → Look up another NPI →
Also registered at 5555 E Arapahoe RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Debbie Andersen, MS, RDRegistered Dietitian1134661937
- Christina AragonSpecialist1134324171
- Kari BednarchikRegistered Nurse1164714960
- Samantha Benning, NPObstetrics & Gynecology Nurse Practitioner1518097377
- Joanna Burch, MDDermatology Physician1144323130
- Kimberly Butler, LPNLicensed Practical Nurse1023208915
Verify Brian P. O'Sullivan in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersColorado Medical Board
Search for license 43257Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
5.0 times the Medicare Part D claims of the average internal medicine physician in 2024
15,786 Medicare Part D claims for 1,200 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 10% of claims. 211 claims were for opioids.
Most prescribed
- Atorvastatin Calcium1,276 claims
- Levothyroxine Sodium750 claims
- Simvastatin714 claims
- Lisinopril693 claims
- Omeprazole629 claims
- Tamsulosin Hcl557 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 PCCentennial, CO
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Brian P. O'Sullivan among 2,046 internal medicine physician records in Colorado
Brian P. O'Sullivan 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 2007, is newer than 40% of them.
- NPI issued2007 · 40% of these records are older, 39% newer
- In a Medicare fileYes · 71% of these records are
- In the CMS Doctors and Clinicians fileYes · 53% of these records are
- Graduated1993 · 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).
Internal Medicine Physician providers in Colorado
There are 2,046 internal medicine physician records in Colorado.
All 2,046 in Colorado → Every provider in Centennial → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- David Conway, MDLittleton, CO 801221164415691
- Paul Davidson, MDLittleton, CO 801221760456412
- Andy FineLittleton, CO 801221245261965
- Richard Good, MDLittleton, CO 801221669465183
- Nancy Hooyman, M.D.Littleton, CO 801221952356339
- Kendall Lubeck, MDLittleton, CO 801221427041920
- Melissa Peters, D.O.Centennial, CO 801221609839786
- Karen Ratner, MDLittleton, CO 801221740391739
Common questions
What is Brian P. O'Sullivan's NPI number?
Brian P. O'Sullivan's National Provider Identifier (NPI) is 1801926662, issued on Mar 7, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Brian P. O'Sullivan located?
The NPPES record lists a practice address at 5555 E Arapahoe RD, Centennial, CO, 80122. Phone: (303) 338-4545. Providers update this record themselves, so call before visiting.
How can I verify Brian P. O'Sullivan's license?
NPPES lists Colorado license number 43257, 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 P. O'Sullivan prescribe under Medicare Part D?
In 2024, Brian P. O'Sullivan had 15,786 Medicare Part D claims for 1,200 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.