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WILLIAM PETER SIM M.D.
NPI 1902166531
Internal Medicine in Cerritos, CA

Active since May 16, 2012PECOS EnrolledAccepts Medicare Assignment
10820 183RD ST, DEPT OF INTERNAL MEDICINE, CERRITOS, CA 90703(562) 653-5000 Get Directions Write a Review

NPPES record last updated: December 10, 2021. Verified against the NPPES registry weekly; last sync: August 09, 2026.

About William Peter Sim M.d. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

WILLIAM PETER SIM M.D. (NPI 1902166531) is an individual internal medicine provider in Cerritos, California, licensed in California (A130389) and active in the NPI registry since May 2012. He is enrolled in Medicare PECOS and is a graduate of Un Of California, Irvine, College Of Medicine (2012).

NPPES Registry Identity

NPI1902166531
Entity TypeIndividualMale
Primary Taxonomy207R00000X
Provider Legal NameWILLIAM PETER SIMCredential: M.D.
Location Address10820 183RD ST, DEPT OF INTERNAL MEDICINECerritos, CA 90703-8013
Mailing Address10820 183rd St, Dept Of Internal MedicineCerritos, CA 90703-8013 · (562) 653-5000
Phone(562) 653-5000
Sole ProprietorYes
Medical School CMSUn Of California, Irvine, College Of MedicineGraduated 2012
Enumeration DateMay 16, 2012
Last NPPES UpdateDecember 10, 2021
NPPES CertifiedDecember 7, 2021
✔ NPI 1902166531 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
License✔ Licensed in CA · A130389
Definition
A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.
Also ListedStudent in an Organized Health Care Education/Training ProgramTaxonomy 390200000X
10820 183RD ST, Cerritos, CA 90703
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Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

William Peter Sim M.d. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID5799085403
PECOS Enrollment IDI20151202002112
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 90703 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$142.39 typical visit price
range $62.96 – $187.60
Typical copayment $35.59 (range $15.74 – $46.90)
Most-billed visit code 99204
Established Patient
$109.96 typical visit price
range $20.84 – $153.61
Typical copayment $27.49 (range $5.21 – $38.40)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 9

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

DR. LYNDA TRAN NGO M.D.
Internal Medicine
10820 183RD ST
CERRITOS, CA 90703
Los Angeles County (800) 823-4040
SHAWN WRIGHT PFENDLER MHA
Technician, Health Information
10820 183RD ST
CERRITOS, CA 90703
Los Angeles County (562) 653-5101
DR. MAYUR PATEL
Pharmacist
10820 183RD ST
CERRITOS, CA 90703
Los Angeles County (562) 653-5212
KERRY KAWANO R.PH.
Pharmacist
10820 183RD ST
CERRITOS, CA 90703
Los Angeles County (562) 653-5212
JOYCE IWEN CHOU M.D.
Internal Medicine
10820 183RD ST
CERRITOS, CA 90703
Los Angeles County (800) 823-4040
KAISER FOUNDATION HEALTH PLAN INC
Pharmacy (Community/Retail Pharmacy)
10820 183RD ST, FL 1
CERRITOS, CA 90703
Los Angeles County (844) 359-6405
DENISE PARK MD
Internal Medicine
10820 183RD ST
CERRITOS, CA 90703
Los Angeles County (562) 653-5032
JOYCE HATANAKA FONG
Pharmacist
10820 183RD ST
CERRITOS, CA 90703
Los Angeles County (562) 653-5212

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is William Sim's NPI number?

The NPI number for William Sim is 1902166531. It was assigned to this individual provider in the NPPES registry on May 16, 2012.

Where is William Sim located?

William Sim practices at 10820 183rd St Dept Of Internal Medicine, Cerritos, CA 90703. The listed phone number is (562) 653-5000.

What is William Sim's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

Is William Sim enrolled in Medicare?

Yes. William Sim is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

When was this NPI record last updated?

The NPPES record for William Sim was last updated on December 10, 2021. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.