Brian P. O'Sullivan
- Medicare services, 2021
- 42
- Part D claims, 2024
- 15,786
- Hospital affiliations
- 1
- Medical group
- 1
- State license
- 1
- Practice address
- 5555 E Arapahoe Rd, Littleton, CO 80122
- Practice phone
- Call (303) 338-4545
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Arapahoe Medical Offices
Urgent Care Center · Littleton, Colorado
Find Brian O'Sullivan's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Brian P. O'Sullivan is an internist in Littleton, Colorado
Brian O'Sullivan practices at Arapahoe Medical Offices in Littleton, Colorado.
Brian O'Sullivan's NPI, 1801926662, was assigned on March 7, 2007. Brian O'Sullivan graduated from Geisel School of Medicine at Dartmouth in 1993. Brian O'Sullivan holds Colorado license 43257.
- NPI
- 1801926662NPI Registry (opens in a new tab)
- Medicare PAC ID
- 9739091984
- NPI enumeration date
- March 7, 2007
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (303) 338-4545
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 59
- Medical school graduation
- 1993
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Brian P. O'Sullivan practices at Arapahoe Medical Offices in Littleton, Colorado
Brian O'Sullivan's primary practice is Arapahoe Medical Offices, at 5555 E Arapahoe Rd, Littleton, CO 80122. The practice phone is (303) 338-4545.
- Arapahoe Medical Offices5555 E Arapahoe Rd, Littleton, CO 80122Phone(303) 338-4545
Source: Dmand AI Affiliation Data
Brian P. O'Sullivan is affiliated with 5 sites of care and 1 medical group
Brian O'Sullivan's primary practice is Arapahoe Medical Offices in Littleton, Colorado. Brian O'Sullivan is also affiliated with Baystate Medical Center. The medical group on file is Colorado Permanente Medical Group. Dmand AI also links Brian O'Sullivan to 1 more breast imaging center, 1 group practice or clinic and 1 therapy and rehab clinic, each named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Brian P. O'Sullivan's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Brian O'Sullivan practices, 5 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Arapahoe Medical Offices | Available with a free account |
| +4 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
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Brian P. O'Sullivan is one of 1,668 internists in Colorado
Internal medicine is Brian O'Sullivan's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Brian O'Sullivan is licensed in Colorado.
Specialties and state licenses
- Internal medicine, ColoradoPrimary
Internists near Brian O'Sullivan
Counts of internists with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Brian P. O'Sullivan billed Medicare for 42 services in 2021
CMS data shows 42 Medicare services from Brian O'Sullivan across 1 procedure code in 2021. Medicare paid $1,730 for them. Every service was in an office.
Brian O'Sullivan compared with the Colorado median for internists, 2021
- Brian O'Sullivan
- Colorado median
- Medicare services
- 42vs 37789% below
- Part D claims
- 15,183vs 31847.7 times
Medians across 1,630 internists in Colorado with Dmand AI profiles that report each measure.
Brian O'Sullivan's most billed Medicare procedure codes, 2021
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Medicare shows one payer. Book a meeting to get commercial claims data for Brian O'Sullivan and other internists in Colorado.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Brian P. O'Sullivan's patients have a median age of 74
Across all payers, Dmand AI patient panel data puts Brian O'Sullivan's median patient age at 74, with 46% women.
Brian O'Sullivan's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 74
Patient panel by sex, all payers
- Women46%
- Men54%
Source: Dmand AI Patient Panel Data
Brian P. O'Sullivan wrote 15,786 Medicare Part D claims in 2024
In 2024, Brian O'Sullivan wrote 15,786 Medicare Part D claims for 1,200 patients. 90% of them were for generic drugs. CMS names the drug for 15,183 of them, across 137 drugs with 11 or more claims each, at $683,130 in total drug cost. In 2023, CMS named 15,294 claims across 133 drugs.
Brian O'Sullivan's Part D claims by kind of drug, 2024
- Generic14,174 claims90%
- Brand-name1,538 claims10%
- Other74 claims0%
Brian O'Sullivan's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Brian O'Sullivan's Part D claims, 2024
- Opioids1%211 of 15,786 claims
- Antibiotics2%260 of 15,786 claims
- Antipsychotics, patients 65 and over0%15 of 15,786 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 15,2942024: 15,1831%
Drugs named by CMS: 137 in 2024, 133 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
How Brian P. O'Sullivan takes part in Medicare
Brian O'Sullivan accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Brian P. O'Sullivan graduated from Geisel School of Medicine at Dartmouth
Brian O'Sullivan graduated from Geisel School of Medicine at Dartmouth in 1993.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Brian P. O'Sullivan's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel Data |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Brian P. O'Sullivan
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Brian P. O'Sullivan's NPI number?
Brian P. O'Sullivan's NPI number is 1801926662. It was assigned on March 7, 2007, and it is active in the NPI Registry.
What does Brian P. O'Sullivan specialize in?
Brian P. O'Sullivan is an internist in Littleton, Colorado. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Brian P. O'Sullivan practice?
Brian O'Sullivan practices at 5555 E Arapahoe Rd, Littleton, CO 80122. Brian O'Sullivan's primary practice is Arapahoe Medical Offices in Littleton, Colorado. Dmand AI also links Brian O'Sullivan to 1 breast imaging center, 1 group practice or clinic and 1 therapy and rehab clinic.
What is Brian P. O'Sullivan's office phone number?
The practice phone on file for Brian O'Sullivan is (303) 338-4545.
What is Brian P. O'Sullivan's medical license number?
Brian O'Sullivan holds Colorado license 43257.
Which hospitals is Brian P. O'Sullivan affiliated with?
Brian O'Sullivan is affiliated with Baystate Medical Center.
What medical group is Brian P. O'Sullivan part of?
Brian O'Sullivan is linked to Colorado Permanente Medical Group.
Does Brian P. O'Sullivan accept Medicare?
Yes. CMS data shows Brian O'Sullivan billed Medicare for 42 services in 2021, and Brian O'Sullivan accepts Medicare assignment.
What services does Brian P. O'Sullivan bill to Medicare?
In 2021, Brian O'Sullivan's most billed Medicare services were medical service (0064A).
Where did Brian P. O'Sullivan go to medical school?
Brian O'Sullivan graduated from Geisel School of Medicine at Dartmouth in 1993.
What drugs does Brian P. O'Sullivan prescribe most?
In 2024 Medicare Part D data, Brian O'Sullivan's most prescribed drugs by claims were Atorvastatin Calcium, Levothyroxine Sodium and Simvastatin.
How long has Brian P. O'Sullivan been practicing?
Brian O'Sullivan graduated from medical school in 1993, 33 years ago.
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