Ton-That, Chau

Ton-That, Chau was paid $1.83M by Medicaid between Jan 2018 and Aug 2023, across 2 billing codes. Its largest line is 99213, doctor's office visit, returning patient (routine) — 97% of everything it billed.

33Billing provider infoTON-THAT, CHAU
WESTMINSTER, CA 92683

33aNPI1205902301assigned 11/28/2006

33bProvider typePsychiatry Physician

28Total paid$1.83M

24GClaims32,389

24DCodes billed2

24AFirst – last monthJan 2018 – Aug 2023

Compared with peers

Next to other Psychiatry Physician providers in California

Rank by total paid#39 of 483

Median peer was paid$24K

This provider vs. median76×

Peers share this provider's primary NPPES type and state. Size alone says nothing about billing quality: a big agency or a hospital system is expected to sit far above the median.

Auditor's notes

Automated statistical signals. Not evidence of fraud — how these are computed.

Single-Code Concentration97% of spending on code 99213 with only 2 total codes billed. Highly concentrated billing profile.

Box 24A · Dates of service

Paid by month

Paid that monthNov–Dec 2024: claims still arriving when the file was cut, so these months run low for every provider

By year, as a table

Year	Claims	Paid
2018	5,270	$250K
2019	7,278	$350K
2020	4,546	$288K
2021	5,482	$339K
2022	5,838	$350K
2023	3,975	$252K

Box 24 · Service lines

What it billed for

Code	Service	Share	Claims	Bene. records	Paid
99213	Doctor's office visit, returning patient (routine)Office or other outpatient visit for the evaluation and management of an established patient, low complexity	97%	31,976	25,945	$1.77M
99205	Prolong outpt/office vis	3.0%	413	343	$55K

Claims and beneficiary counts add up across code × month rows, so one patient seen every month counts many times. Rows with fewer than 12 claims are suppressed by HHS, so small lines can be missing.