Claire Oosterbaan, DO
Family Medicine Physician · Chicago, IL
Claire Oosterbaan, DO is a family medicine physician with a practice address in Chicago, Illinois, and NPI 1083309918, issued on Apr 6, 2023. Check the license on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- Claire Oosterbaan
- Credential
- DO
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- Practice location
- 4600 N Ravenswood Ave, Chicago, IL 60640
- Phone
- (773) 561-7500
- Enumerated
- Apr 6, 2023
- Entity
- Type 1 · individual
Also registered at 4600 N Ravenswood Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Brandon Bautista, DOFamily Medicine Physician1619727013
- Tiffany BlacklidgeStudent in an Organized Health Care Education/Training Program1235959511
- Jacob Broadrick, MSN RNRegistered Nurse1598576860
- Shannon BurkeFamily Medicine Physician1992682991
- Mariela Cano, M.D.Family Medicine Physician1053342204
- Diana Chavez, DOStudent in an Organized Health Care Education/Training Program1225731391
Verify Claire Oosterbaan in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersIllinois Department of Financial and Professional RegulationCheck the board
- 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS, AOA, NCCPA, AANPNot checked
92% fewer Medicare Part D claims than the average family medicine physician in 2024
271 Medicare Part D claims for 42 beneficiaries, against an average of 3,519 among the 111,126 providers of this specialty who prescribed in Part D.
Most prescribed
- Atorvastatin Calcium36 claims
- Amlodipine Besylate15 claims
- Gabapentin14 claims
- Levothyroxine Sodium12 claims
- Lisinopril12 claims
- Hydrochlorothiazide11 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.
1,497 family medicine physician records list a Chicago practice address
They are 1,497 of the 63,379 NPPES records with a Chicago practice address, and 5,925 family medicine physician records in Illinois.
All 1,497 in Chicago → All 5,925 in Illinois → Every provider in Chicago →
Other family medicine physician records in Illinois
- Jon Aagaard, MDWheaton, IL1750496923
- Napoleon Abando, MDWoodstock, IL1003972753
- Nikka Abaricia, MDChicago, IL1790366342
- Mohemmed AbbasChicago, IL1609612522
- Muhammad AbbasAlton, IL1588341556
- Syed AbbasWest Dundee, IL1972733103
- Stefanie AbbottMaywood, IL1861137457
- Roann Abdeladl, MDEvanston, IL1437087103
- Ashraf Abdeljaber, M.DNormal, IL1023472636
- Ahmed Abdelkader, MDChicago, IL1659104230
Common questions
What is Claire Oosterbaan, DO's NPI number?
Claire Oosterbaan, DO's National Provider Identifier (NPI) is 1083309918, issued on Apr 6, 2023. An NPI identifies a provider in billing; it is not a license.
Where is Claire Oosterbaan, DO located?
The NPPES record lists a practice address at 4600 N Ravenswood Ave, Chicago, IL, 60640. Phone: (773) 561-7500. Providers update this record themselves, so call before visiting.
How can I verify Claire Oosterbaan, DO's license?
Search the Illinois Department of Financial and Professional Regulation at https://idfpr.illinois.gov/checklicense.html. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Claire Oosterbaan, DO prescribe under Medicare Part D?
In 2024, Claire Oosterbaan, DO had 271 Medicare Part D claims for 42 beneficiaries; the average among family medicine physician prescribers was 3,519. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), loaded Aug 27, 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.
Every figure on PlainDoctor is rendered directly from the federal CMS NPPES registry, Medicare Part D, MIPS, and Open Payments records, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 27, 2026.