Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Dr. Timothy Leonor Tan, DO

Individual provider Anatomic Pathology & Clinical Pathology Physician · NPI 1205272507

Dr. Timothy Leonor Tan, DO is a Pathology in Seattle, Washington. Graduated from Midwestern University, Chicago College of Osteopathic Med in 2013, 13 years ago. Practices with Christina G Steil Dermatology Ltd, a 7-clinician group, works from 5 locations and accepts Medicare assignment. Licensed in Illinois, Indiana and Washington.

Years since qualifying
13
Trained at
Midwestern University, Chicago College of Osteopathic Med
Licensed in
IL, IN, WA
In the registry since
2013
Specialties on file
3
What do these letters mean?
DO — Doctor of Osteopathic Medicine
A fully licensed physician, trained like an MD with additional musculoskeletal training. Equivalent practice rights in all 50 states.

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Practice location Address checks out

2815 Eastlake Ave E Ste 240
Seattle, WA 98102-3086
Phone: (503) 906-7300
Fax: (503) 245-8219
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (4)

  • 1633 Medical Center Pt, Colorado Springs, CO 80907-5700 — (503) 906-7300
  • 251 E Huron St, Chicago, IL 60611-2908 — (312) 926-2000
  • 3131 S State St Ste 309, Ann Arbor, MI 48108-1658 — (503) 245-8219
  • 9750 Sw Nimbus Ave, Beaverton, OR 97008-7172 — (503) 906-7300

Specialties & licences

Dermatopathology (Pathology) Physician (primary) Taxonomy 207ZD0900X · Licence 70062322 (WA)
Anatomic Pathology & Clinical Pathology Physician Taxonomy 207ZP0102X · Licence 125064426 (IL)
Anatomic Pathology & Clinical Pathology Physician Taxonomy 207ZP0102X · Licence 02007763A (IN)

Record details

NPI number1205272507
Entity typeIndividual (Type 1)
GenderMale
Credentials DO
Sole proprietorNo
NPI enumeratedMay 14, 2013
Last updated in NPPESNovember 26, 2025
Certification dateNovember 26, 2025
Mailing addressPo Box 230457, Portland, OR 97281-0457

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyPATHOLOGY
Medical schoolMIDWESTERN UNIVERSITY, CHICAGO COLLEGE OF OSTEOPATHIC MED
Graduated 2013 (13 years in practice)
Group practice Christina G Steil Dermatology Ltd — 7 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations4 on file with Medicare

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