What is Mark Lee's specialty?

Mark Lee (NPI 1558322479) is a Medicare-billing provider whose primary specialty is Nephrology in Whittier, CA.

Where does Mark Lee practice?

Mark Lee practices in Whittier, CA, based on the location reported in the CMS Medicare provider datasets for NPI 1558322479.

How much does Medicare pay Mark Lee?

Mark Lee (NPI 1558322479) received approximately $221K in total Medicare Part B payments, serving 205 beneficiaries, per the CMS Medicare Physician & Other Practitioners dataset.

PROVIDER PROFILE · NPI 1558322479

Mark LeeMD

PRACTICEWILLY SINGH DO INCSee all providers at this practice →

NephrologyWhittier, CAI

MEDICARE UTILIZATION · PART B · 2024

Total beneficiaries

306

Unique beneficiaries

—

Total services

1,063

Distinct HCPCS

Medicare payment

$214K

Peer benchmark

Total Medicare services vs. 985 Nephrology providers in CA — below median (cohort median 1,482).

PRESCRIBING · PART D · 2024

Total Rx claims

3,650

Beneficiaries

—

Total drug cost

$1.1M

Distinct drugs

Brand share

33.0%

Top prescribed drugs

Parenteral Amino Acid 20% No.1269 claims

Amlodipine Besylate212 claims

Sucroferric Oxyhydroxide207 claims

Sevelamer Carbonate205 claims

Dapagliflozin Propanediol156 claims

QUALITY · MIPS · 2024

No data available for this provider in 2024.

INDUSTRY PAYMENTS · OPEN PAYMENTS · 2025

Total received

$590

Payment records

By payment type

Food and Beverage$590

Top paying entities

Food and Beverage$590

REFERRAL NETWORK

Where Mark 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). 54 inbound referrers · 0 outbound destinations.

Receives referrals from

Inbound — who sends patients here

Physician	Patients	Visits
NPI 1255335535	140	1,691
PIH HEALTH DOWNEY HOSPITAL	117	416
PIH HEALTH WHITTIER HOSPITAL	93	577
Unilab Corporation Clinical Laboratory · West Hills, CA	65	273
BARRETT, IVAN	50	227
Hung Nguyen Family Practice · Orange, CA	50	760
Reza Sharafi Internal Medicine · Downey, CA	44	516
TOTAL RENAL CARE INC	39	614
Alireza Jafari Cardiology · Whittier, CA	36	174
RENAL TREATMENT CENTERS CALIFORNIA INC	35	570
Zareh Ounjian Diagnostic Radiology · Whittier, CA	31	115
Yong Park Diagnostic Radiology · Whittier, CA	31	128

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