Claire Oosterbaan, DO
NPI 1083309918 · Family Medicine Physician · Chicago, IL
Claire Oosterbaan, DO is a Family Medicine Physician provider in Chicago, IL (NPI 1083309918).
Provider details
- NPI number
- 1083309918
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- DO
- Sex
- Female
- Sole proprietor
- No
- License
- 125.082997 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
3 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 10 distinct drugs on file.
| Drug | Part D claims (2024) |
|---|---|
| Atorvastatin Calcium | 36 |
| Amlodipine Besylate | 15 |
| Gabapentin | 14 |
| Levothyroxine Sodium | 12 |
| Lisinopril | 12 |
| Hydrochlorothiazide | 11 |
| Losartan Potassium | 11 |
| Memantine Hcl | 11 |
| Sertraline Hcl | 11 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2023-04-06
- Last updated
- 2023-07-05
- Certified
- 2023-07-05
Frequently asked questions
- What is Claire Oosterbaan's NPI number?
- Claire Oosterbaan's National Provider Identifier (NPI) is 1083309918, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Claire Oosterbaan's specialty?
- Claire Oosterbaan is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Claire Oosterbaan located?
- Claire Oosterbaan's practice location on file with NPPES is 4600 N Ravenswood Ave, Chicago, IL 60640-4510.
- What is Claire Oosterbaan's phone number?
- The practice phone number listed in the NPPES registry for Claire Oosterbaan is (773) 561-7500.
- Is Claire Oosterbaan's NPI active?
- Yes — Claire Oosterbaan's NPI (1083309918) is active in the NPPES registry as of the last update on 2023-07-05.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.