Doctor profile · Federal record

Dr. Lillian Tseng, M.D.

Internal Medicine Physician (CMS: Internal Medicine) · Walnut Creek, CA

  • NPI 1619016169
  • Accepts Medicare
  • 22 yrs in practice
  • Female
  • Group practice
  • No sanctions

Practice & contact

NPPES Updated May 11, 2026
Primary practice
1515 Newell Ave
Walnut Creek, CA 945965120
(925) 295-4000

Credentials & registration

NPPES · NUCC
NPI registered
February 2007 — 19 yrs on file
Profile last updated
December 13, 2021
Year of graduation
2004 — 22 yrs since
Specialty taxonomy
207R00000X — NUCC code
State license (1)
California #A92629

Federal sanctions & exclusions

OIG LEIE Updated May 11, 2026

No sanctions, exclusions or revocations on file

Checked against OIG LEIE on NPI 1619016169. Last verified May 11, 2026.

Medicare procedures · 2023

Top services delivered

CMS Provider Utilization
Total services
53
Distinct HCPCS
1
Medicare allowed
$4,666
HCPCS Description Services Patients Avg allowed
99232 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes 53 17 $88

In context: peer comparison

Among 44 peers in Walnut Creek Internal Medicine Physician, average services per provider: 260. This provider delivers 0.2× the peer median.

Frequently asked questions

Auto-generated from federal data
What is Dr. Lillian Tseng's medical specialty?
Dr. Lillian Tseng practices Internal Medicine Physician in Walnut Creek, CA.
Where does Dr. Lillian Tseng practice?
Dr. Lillian Tseng practices at 1515 Newell Ave, Walnut Creek, CA 945965120. Office phone: 9252954000.
What is Dr. Lillian Tseng's NPI?
Dr. Lillian Tseng's National Provider Identifier (NPI) is 1619016169, issued by NPPES.
Does Dr. Lillian Tseng accept Medicare assignment?
Yes. Dr. Lillian Tseng accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Lillian Tseng commonly perform?
Top Medicare-reported procedures in 2023: Subsequent hospital care with moderate levelof medical decision making (HCPCS 99232). Source: CMS Medicare Physician & Other Practitioners file.