Quick answers
- Does Colin J. Obrien accept Medicare assignment?
- Yes. Medicare's clinician data says Colin J. Obrien accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does Colin J. Obrien see?
- In 2024, CMS data shows 1,439 Original Medicare patients and 13,504 services for Colin J. Obrien. This counts Original Medicare only and measures volume, not quality.
- What is Colin J. Obrien's NPI number?
- 1134173016. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Colin J. Obrien, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 1,439 |
|---|---|
| Services billed to Medicare | 13,504 |
| Different services or procedures | 118 |
| Participating Medicare provider | Yes |
| Average age of these patients | 75 |
Most frequent services
- Injection, gadoterate meglumine, 0.1 ml (A9575)7,633 services
- Low osmolar contrast material, 300-399 mg/ml iodine concentration, per ml (Q9967)3,876 services
- X-ray of chest, 2 views (71046)200 services
- Mri scan of lower spinal canal without contrast (72148)142 services
- Ct scan head or brain without contrast (70450)80 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- High blood pressure73%
- High cholesterol72%
- Arthritis55%
- Anxiety27%
- Diabetes25%
- Depression25%
Hospitals where Colin J. Obrien works
Medicare's Facility Affiliation Data lists Colin J. Obrien at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.
- Compass Memorial HealthcareMarengo, IA · Critical Access Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 161317
- Mahaska Health PartnershipOskaloosa, IA · Critical Access Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 161379
Practice locations
Addresses where Colin J. Obrien is enrolled with Medicare (CMS data updated October 2, 2026).
- 201 Trueblood AveOskaloosa, IA 52577 (641) 676‑7361
- 2769 Heartland DrCoralville, IA 52241 (319) 545‑7300
- 401 Butternut LnIowa City, IA 52246 (641) 672‑3315
- 500 E Market StIowa City, IA 52245 (319) 339‑3629
Group practices
Medicare enrollment lists Colin J. Obrien as a member of these groups (CMS data updated October 2, 2026).
- Mahaska County Hospital128 clinicians in the group
- Radiologic Medical Services PC29 clinicians in the group
- Corridor Radiology LLC7 clinicians in the group
Specialties
- Diagnostic Radiologyprimary
Other radiologists in Oskaloosa
Clinicians with the same Medicare primary specialty in Oskaloosa, IA — not a recommendation.
Other clinicians in Mahaska County Hospital
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Iowa, Rj & L Carver College Of Medicine |
| Graduation year | 1996 (30 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1134173016 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians