Active NPI 1598100323 Individual Practitioner Male Practitioner

Dr. William Oh , MD

Colon & Rectal Surgery • Irvine, CA

✓ Accepts Medicare Assignment

Professional Overview & Biography Verified Profile Summary

Dr. William Oh, MD is a certified Colon & Rectal Surgery practicing in Irvine, CA. With approximately 13 years of clinical experience since completing medical education in 2013, Dr. Oh delivers high-quality medical care to the local community at 16405 SAND CANYON AVE STE 280.

Dr. Oh is affiliated with Hoag Clinic and accepts Medicare assignment.

Frequently performed procedures and clinical services include new patient outpatient office visit, subsequent hospital care with moderate levelof medical decision making, if using time, at least, initial hospital care with moderate level of medical decision making, if using time, at least. Full Medicare procedure pricing transparency rates and service volume details are listed on this profile.

Practice Location & Contact Primary Location

Practice Address

16405 Sand Canyon Ave Ste 280

Irvine, CA 926183792

Telephone 9495570370

Fax 9495570370

Associated Practice Facility / Clinic

🏢 Specialty Physicians Of Illinois, Llc Facility NPI 1124075676

Medicare Profile & Education

Medical School

Other

Graduation Year

2013

Medicare Assignment

✓ Accepts Assignment

Telehealth Flag

In-Person Only

Specialty Benchmarks & Practice Insights

Comparative analytics for Colon & Rectal Surgery in Irvine, CA

Established Specialist (10-20 Yrs)

Practitioner Clinical Experience

13 Yrs -7.8 yrs vs City Avg

City Avg: 20.8 Yrs

State Avg: 25.1 Yrs

Regional Practice Density

7 Specialists

Practicing in Irvine, CA (205 Statewide)

Telehealth Adoption Rate

28.6% Regional Adoption

In-Person Office Visits Only

Medicare Pricing Discount

69.8% Avg Savings

Under CMS Medicare Fee Schedule vs Standard Submitted Charges

Clinical Seniority & Experience Comparison

Dr. Oh (13 Years) 13 Yrs

Irvine Specialty Average (20.8 Years) 20.8 Yrs

Performed Procedures & Service Volume

Top Medicare Part B procedures performed by this practitioner

CMS Official Data (2024)

Reporting Year:

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99205 New patient office or other outpatient visit with a high level of medical decision making, if using time, 60 minutes or more	56	56	$571.00	$185.01
99232 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes	31	12	$162.32	$81.36
99223 Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes	17	17	$546.00	$179.13
99213 Established patient office or other outpatient visit, typically 15 minutes	16	11	$228.75	$68.54
46600 Diagnostic examination of the anus using an endoscope	14	14	$334.00	$44.27
99204 New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more	12	12	$461.00	$138.36

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
46600 Diagnostic examination of the anus using an endoscope	18	18	$262.00	$122.33
99204 New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more	18	18	$418.00	$165.29
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	17	15	$274.00	$127.18
99203 New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more	16	16	$274.00	$111.55
99213 Established patient office or other outpatient visit, typically 15 minutes	15	13	$187.00	$89.99

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99204 New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more	60	60	$378.00	$160.27
99211 Office or other outpatient visit for the evaluation and management of established patient that may not require presence of healthcare professional	52	45	$53.00	$22.01
46600 Diagnostic examination of the anus using an endoscope	44	43	$253.00	$127.09
99232 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes	20	16	$166.00	$70.71
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	17	15	$261.00	$122.05
99204 New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more	15	15	$378.00	$127.94
99213 Established patient office or other outpatient visit, typically 15 minutes	14	13	$184.00	$91.62
46600 Diagnostic examination of the anus using an endoscope	11	11	$253.00	$37.74
45300 Diagnostic examination of rectum and large bowel using an endoscope	11	11	$312.00	$135.10
99203 New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more	11	11	$251.00	$113.05

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
46600 Diagnostic examination of the anus using an endoscope	28	23	$266.64	$125.92
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	26	19	$359.81	$135.78
99441 Telephone medical discussion with physician, 5-10 minutes	24	18	$89.75	$59.17
99205 New patient office or other outpatient visit with a high level of medical decision making, if using time, 60 minutes or more	19	19	$549.37	$228.86
99204 New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more	13	13	$416.69	$159.55
99443 Telephone medical discussion with physician, 21-30 minutes	12	12	$195.08	$135.75
99215 Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more	11	11	$378.18	$187.89

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99205 New patient office or other outpatient visit with a high level of medical decision making, if using time, 60 minutes or more	55	55	$539.40	$211.69
46600 Diagnostic examination of the anus using an endoscope	38	33	$245.00	$110.42
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	22	16	$282.00	$113.48
99443 Telephone medical discussion with physician, 21-30 minutes	21	19	$153.86	$113.05
99212 Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more	19	12	$115.00	$45.63
99441 Telephone medical discussion with physician, 5-10 minutes	18	16	$55.83	$45.70
45385 Removal of polyps or growths of large bowel using an endoscope with mechanical snare	17	17	$1429.00	$265.53
45300 Diagnostic examination of rectum and large bowel using an endoscope	16	15	$342.00	$131.99
99442 Telephone medical discussion with physician, 11-20 minutes	15	12	$110.20	$77.25
45380 Biopsy of large bowel using an endoscope	15	15	$1273.00	$80.61
99223 Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes	12	12	$523.00	$208.30

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99205 New patient office or other outpatient visit with a high level of medical decision making, if using time, 60 minutes or more	26	26	$537.00	$210.69

Medical Specialties & State Licenses

CMS Verified: 2026-05-07

Colon & Rectal Surgery Primary Specialty

NUCC Taxonomy Code: 208C00000X

State License CA A136780

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.

Hospital & Practice Group Affiliations

Hoag Clinic

1 Hoag Dr, Newport Beach, CA 926634162

Hoag Clinic

16405 Sand Canyon Ave, Irvine, CA 926183786

Phone: 9493834190

Hoag Clinic

1031 Avenida Pico, San Clemente, CA 926736352

Phone: 9498295533

Practice Associates & Co-Workers

Healthcare professionals and specialists practicing at this location or sharing practice phone/fax

1 Associated Practitioners

Dr. Ziyad Jabaji , MD

Colon & Rectal Surgery

NPI 1366760514

Doctor of Medicine (M.D.)

Career & Practice History Timeline

Chronological log of verified NPI updates, location relocations, credentials, and registry changes

12 Historical Events

📍

Updated Practice Location May 07, 2026

Registered at 16405 SAND CANYON AVE STE 280, IRVINE, CA 926183792 (Tel: 9495570370)

🎓

Medical Taxonomy / Specialty Registered (Primary Specialty) May 07, 2026

Colon & Rectal Surgery (License #A136780 in CA)

🎓

Medical Taxonomy / Specialty Registered (Primary Specialty) October 15, 2021

Colon & Rectal Surgery (License #MD61169814 in WA)

📍

Updated Practice Location May 14, 2019

Registered at 1215 HADLEY RD STE 201, MOORESVILLE, IN 46158 (Tel: 3178342020)

📍

Updated Business Mailing Address May 14, 2019

Registered at PO BOX 781076, DETROIT, MI 482781076 (Tel: 3175284800)

🎓

Medical Taxonomy / Specialty Registered (Primary Specialty) May 14, 2019

Colon & Rectal Surgery (License #01079645A in IN)

✅

NPI Profile Active May 07, 2013

NPI status registered as active in NPPES database

📍

Updated Practice Location May 07, 2013

Registered at 155 N FRESNO ST, FRESNO, CA 937012302 (Tel: 5594996400)

📍

Updated Business Mailing Address May 07, 2013

Registered at 155 N FRESNO ST, FRESNO, CA 937012302

👤

Provider Name / Credentials Updated May 07, 2013

Recorded as WILLIAM OH, M.D.

🎓

Medical Taxonomy / Specialty Registered (Primary Specialty) May 07, 2013

Student in an Organized Health Care Education/Training Program

🟢

Initial NPI Registration & Enumeration May 07, 2013

First registered as active Individual Practitioner in NPPES Database.

Patient & Community Reviews

Verified patient ratings, medical care experiences, and facility photos

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NPI Administrative Meta

NPI Number: 1598100323

Entity Type:

Individual Provider Physician, Nurse Practitioner, or Solo Healthcare Professional (Type 1 NPI)

Enumeration Date: May 07, 2013

Last Update: May 07, 2026

Sole Proprietor: No

Update or Correct Profile

Mailing Address

Po Box 781076

Detroit, MI 482781076

Phone: 3175284800

Public Domain Record This profile contains public domain information published by CMS and NPPES under the Freedom of Information Act (FOIA).

⚠️ Medical Disclaimer

This directory listing is for informational purposes only and does not constitute medical advice, diagnosis, or physician endorsement. If you are experiencing a medical emergency, please call 911 immediately.