Quick answers
- Where does Catherine D. Tan see patients?
- Medicare's clinician data lists 8 practice locations, including Chicago, IL, Buffalo Grove, IL and Barrington, IL. Call before your visit to confirm the address.
- What is Catherine D. Tan's specialty?
- Medicare lists Obstetrics/Gynecology as the primary specialty.
- Does Catherine D. Tan accept Medicare assignment?
- Yes. Medicare's clinician data says Catherine D. Tan accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- What is the phone number for Catherine D. Tan?
- (312) 666-6511, as listed in official Medicare / NPI Registry data.
- What is Catherine D. Tan's NPI number?
- 1518429422. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Practice locations
Addresses where Catherine D. Tan is enrolled with Medicare (CMS data updated 2026-10-02). The first 5 of 8; the Medicare profile lists all.
- 1817 S Loomis StChicago, IL 60608 (312) 666‑6511
- 1817 S Loomis St, Pilsen Family Health CenterChicago, IL 60608 (312) 666‑6511
- 214 McHenry RdBuffalo Grove, IL 60089 (847) 459‑1160
- 2701 W 68th St, 3 SouthChicago, IL 60629 (773) 434‑4040
- 2701 W 68th St 3, Access Located at Holy CrossChicago, IL 60629 (773) 434‑4040
Group practices
Medicare enrollment lists Catherine D. Tan as a member of these groups (CMS data updated 2026-10-02).
- Advocate Health and Hospitals Corporation3,118 clinicians in the group
- Access Community Health Network182 clinicians in the group
Specialties
- Obstetrics/Gynecologyprimary
Other OB-GYNs in Chicago
Clinicians with the same Medicare primary specialty in Chicago, IL — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Illinois College Of Med (chi/peor/rock/chm-Urb) |
| Graduation year | 2019 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1518429422 |
| 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
- National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
- 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