1. Home
  2. Directory
  3. California
  4. Irvine
  5. Colon Rectal Surgery
  6. NPI Profile

WILLIAM OH M.D.
NPI 1598100323
Colon & Rectal Surgery in Irvine, CA

Active since May 07, 2013PECOS EnrolledAccepts Medicare Assignment
16405 SAND CANYON AVE STE 280, IRVINE, CA 92618(949) 557-0370(949) 557-0370 Get Directions Write a Review

NPPES record last updated: May 7, 2026. Verified against the NPPES registry weekly; last sync: August 02, 2026.

Record update history: May 7, 2026, Oct 15, 2021, May 14, 2019 (3 updates tracked since 2019).

About William Oh M.d. NPPES

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

WILLIAM OH M.D. (NPI 1598100323) is an individual colon & rectal surgery provider in Irvine, California, licensed in California (A136780) and active in the NPI registry since May 2013. He is enrolled in Medicare PECOS and is a graduate of Other (2013).

NPPES Registry Identity

NPI1598100323
Entity TypeIndividualMale
Primary Taxonomy208C00000X
Provider Legal NameWILLIAM OHCredential: M.D.
Location Address16405 SAND CANYON AVE STE 280Irvine, CA 92618-3792
Mailing AddressPo Box 781076Detroit, MI 48278-1076 · (317) 528-4800
Phone(949) 557-0370
Fax(949) 557-0370
Sole ProprietorNo
Medical School CMSOtherGraduated 2013
Enumeration DateMay 7, 2013
Last NPPES UpdateMay 7, 20263 updates tracked since enumeration
NPPES CertifiedMay 7, 2026
✔ NPI 1598100323 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyColon & Rectal SurgeryAllopathic & Osteopathic Physicians
Taxonomy Code208C00000X
License✔ Licensed in CA · A136780
Definition
A colon and rectal surgeon is trained to diagnose and treat various diseases of the intestinal tract, colon, rectum, anal canal and perianal area by medical and surgical means. This specialist also deals with other organs and tissues (such as the liver, urinary and female reproductive system) involved with primary intestinal disease.
16405 SAND CANYON AVE STE 280, Irvine, CA 92618
Open in Google Maps ↗

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 Oh 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 ID4082960737
PECOS Enrollment IDI20190927001873
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.

Areas of Expertise CMS Part B claims 6

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

New patient office or other outpatient visit with a high level of medical decision making, if using time, 60 minutes or more 99205
This is a first-time patient visit where a healthcare professional spends 60-74 minutes with you. It involves a comprehensive evaluation, including your medical history and current health condition. They'll also advise on preventive health measures and formulate a treatment plan if needed.
56 services56 patients
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes 99232
Follow-up hospital inpatient care involves daily check-ups while you're admitted in the hospital. Typically, a healthcare provider spends about 25 minutes each day reviewing your condition, adjusting treatment if needed, and answering any questions you might have.
31 services12 patients
Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes 99223
Initial hospital inpatient care per day, typically 70 minutes, refers to the daily medical service provided to patients admitted to the hospital. This includes a comprehensive evaluation, diagnosis, treatment plan, and monitoring of your health condition. It ensures your well-being during your hospital stay.
17 services17 patients
Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more 99213
This is a routine visit for patients who have already been seen by the healthcare provider. During this approximately 20-29 minute appointment, your health status will be evaluated and any necessary treatments or tests will be discussed. It's a chance to address any health concerns you may have.
16 services11 patients
Diagnostic exam of anus using an endoscope 46600
This procedure involves using a thin, flexible instrument called an endoscope to examine the anal area. It helps detect any abnormal conditions or issues. It's a safe, routine exam performed by a healthcare professional.
14 services14 patients
New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more 99204
This is a first-time office or outpatient visit lasting between 45-59 minutes. The healthcare provider evaluates your health, discusses your medical history, and may suggest further tests or treatments. It's an opportunity to ask questions and understand your health better.
12 services12 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 92618 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
$96.36 typical visit price
range $62.96 – $187.60
Typical copayment $24.09 (range $15.74 – $46.90)
Most-billed visit code 99203
Established Patient
$77.96 typical visit price
range $20.84 – $153.61
Typical copayment $19.49 (range $5.21 – $38.40)
Most-billed visit code 99213
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 3

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

PATRICK LEE
Internal Medicine (Transplant Hepatology)
16405 SAND CANYON AVE STE 280
IRVINE, CA 92618
Orange County (949) 764-5793
DR. ZIYAD BAHIJE JABAJI M.D.
Colon & Rectal Surgery
16405 SAND CANYON AVE STE 280
IRVINE, CA 92618
Orange County (949) 557-0370
RASHMI KUMAR MD
Internal Medicine (Gastroenterology)
16405 SAND CANYON AVE STE 280
IRVINE, CA 92618
Orange County (949) 557-0251

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 Oh's NPI number?

The NPI number for William Oh is 1598100323. It was assigned to this individual provider in the NPPES registry on May 7, 2013.

Where is William Oh located?

William Oh practices at 16405 Sand Canyon Ave Ste 280, Irvine, CA 92618. The listed phone number is (949) 557-0370.

What is William Oh's specialty?

The primary specialty registered for this NPI is Colon & Rectal Surgery with taxonomy code 208C00000X.

Is William Oh enrolled in Medicare?

Yes. William Oh 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 Oh was last updated on May 7, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 months 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.