Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

Dr. Doris Tiu Tan, DO

Individual provider Psychiatry Physician · NPI 1578522462

Dr. Doris Tiu Tan, DO practises Psychiatry in Fresno, California. Graduated from Ohio Medical University in 1987, 39 years ago. Practices with Mental Health Systems Inc, a 38-clinician group, works from 3 locations and accepts Medicare assignment. Licensed in California and Florida.

Years since qualifying
39
Trained at
Ohio Medical University
Licensed in
CA, FL
In the registry since
2006
Specialties on file
2
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

2550 W Clinton Ave Bldg A Ste 116
Fresno, CA 93705-4201
Phone: (559) 264-7521
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (2)

  • Family And Youth Alternatives, Fresno, CA 03705 — (559) 245-1157
  • 4441 E Kings Canyon Rd, Fresno, CA 93702-3604 — (559) 600-4099

Specialties & licences

Psychiatry Physician (primary) Taxonomy 2084P0800X · Licence 20A7928 (CA)
Psychiatry Physician Taxonomy 2084P0800X · Licence OS11210 (FL)

Record details

NPI number1578522462
Entity typeIndividual (Type 1)
GenderFemale
Credentials DO
Sole proprietorNo
NPI enumeratedMarch 21, 2006
Last updated in NPPESJune 20, 2023
Certification dateJune 20, 2023

Medicare enrollment

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

Medicare specialtyPSYCHIATRY
Medical schoolOHIO MEDICAL UNIVERSITY
Graduated 1987 (39 years in practice)
Group practice Mental Health Systems Inc — 38 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients55
Services billed 219 a service is one billed item, such as a visit, a test or a procedure
Average patient age57

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Payments from drug and device companies, 2025

Drug and device makers are required by federal law (the Physician Payments Sunshine Act) to report what they pay or give to clinicians, and CMS publishes the reports as Open Payments. This is the 2025 program year. A report is a record of a payment, not an allegation of anything, and many are small items such as meals. Only general payments are listed here; research payments and ownership or investment interests are reported separately by CMS and are not shown.

Food and Beverage $1,313 52 payments · a meal or drink at a meeting or visit, not a fee
Education $111 1 payment · educational material or training, not a fee

Each amount is the sum of what companies reported for that kind of payment in 2025, rounded to the dollar. Not all of it is income to the clinician: a meal is not a fee, a charitable contribution goes to a charity, and a royalty or an acquisition payment is not a salary.

Check a report, or dispute one, at the source in CMS’s own tool, Open Payments. Corrections go through CMS’s dispute process. This site removes a home address on request and asks for no proof, because that is privacy; it will not remove an accurate payment report on request, because that is a statutory public disclosure.

Colleagues at Mental Health Systems Inc

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 38 clinicians in the practice; 12 are shown here.

Other providers in Fresno