What is Onechang Lee's specialty?

Onechang Lee (NPI 1881838662) is a Medicare-billing provider whose primary specialty is Neurosurgery in Fountain Valley, CA.

Where does Onechang Lee practice?

Onechang Lee practices in Fountain Valley, CA, based on the location reported in the CMS Medicare provider datasets for NPI 1881838662.

How much does Medicare pay Onechang Lee?

Onechang Lee (NPI 1881838662) received approximately $57K in total Medicare Part B payments, serving 169 beneficiaries, per the CMS Medicare Physician & Other Practitioners dataset.

PROVIDER PROFILE · NPI 1881838662

Onechang LeeM.D.

PRACTICETIEN T NGUYEN M.D. INC.See all providers at this practice →

NeurosurgeryFountain Valley, CAI

MEDICARE UTILIZATION · PART B · 2024

Total beneficiaries

228

Unique beneficiaries

—

Total services

348

Distinct HCPCS

Medicare payment

$43K

Peer benchmark

Total Medicare services vs. 497 Neurosurgery providers in CA — above median (cohort median 341).

PRESCRIBING · PART D · 2024

No data available for this provider in 2024.

QUALITY · MIPS · 2024

Final MIPS score

89.7

Quality

71.7

Cost

72.5

Improvement activities

40.0

Promoting interop.

0.0

Payment adjustment

0.62%

Group

INDUSTRY PAYMENTS · OPEN PAYMENTS · 2025

No data available for this provider in 2025.

REFERRAL NETWORK

Where Onechang Lee's patients come from & go

Directional shared-patient flow from Medicare claims — who sends patients to this provider (inbound) and where this provider's patients go next (outbound). 5 inbound referrers · 0 outbound destinations.

Receives referrals from

Inbound — who sends patients here

Physician	Patients	Visits
UVA PRINCE WILLIAM MEDICAL CENTER	41	205
Deeni Bassam Pain Management · Manassas, VA	36	115
ERDAG, NAMIK	18	58
Duyanh Vu Diagnostic Radiology · Leesburg, VA	13	34
UVA PRINCE WILLIAM MEDICAL CENTER	11	47

Refers patients to

Outbound — where patients go next

No outbound pairs above the suppression threshold.

Source: CMS Physician Shared Patient Patterns (30-day window, Medicare FFS). Direction = a beneficiary seen by the first provider, then the second, within 30 days; a proxy for referral, not a documented referral. Pairs with fewer than 11 shared beneficiaries are suppressed.

CROSS-REFERENCE

Related data on other Healthparse brands

ProviderScore

OIG/SAM exclusion screening, sanctions history

Healthparse Signals

Monitor this provider for changes — dated NPI change events