Active NPI 1316097439 Individual Practitioner Male Practitioner

Dr. Thomas Kobina Duncan , DO

Surgery • Ventura, CA

✓ Accepts Medicare Assignment

Professional Overview & Biography Verified Profile Summary

Dr. Thomas Duncan, DO is a certified Surgery practicing in Ventura, CA. With approximately 34 years of clinical experience since graduating from Midwestern University, Chicago College Of Osteopathic Med in 1992, Dr. Duncan delivers high-quality medical care to the local community at 300 HILLMONT AVE STE 401.

Dr. Duncan maintains professional affiliations with Ventura County Surgical Associates, County Of Ventura and accepts Medicare assignment.

Frequently performed procedures and clinical services include subsequent hospital care with moderate levelof medical decision making, if using time, at least, critical care, first, 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

300 Hillmont Ave Ste 401

Ventura, CA 930031651

Telephone 8056526201

Fax 8056414416

Associated Practice Facility / Clinic

🏢 Ventura County Surgical Associates Facility NPI 1740892686

Medicare Profile & Education

Medical School

Midwestern University, Chicago College Of Osteopathic Med

Graduation Year

1992

Medicare Assignment

✓ Accepts Assignment

Telehealth Flag

In-Person Only

Specialty Benchmarks & Practice Insights

Comparative analytics for Surgery in Ventura, CA

Senior Veteran Specialist (>20 Yrs)

Practitioner Clinical Experience

34 Yrs +8.3 yrs vs City Avg

City Avg: 25.7 Yrs

State Avg: 27.4 Yrs

Regional Practice Density

18 Specialists

Practicing in Ventura, CA (3346 Statewide)

Telehealth Adoption Rate

27.8% Regional Adoption

In-Person Office Visits Only

Medicare Pricing Discount

66.1% Avg Savings

Under CMS Medicare Fee Schedule vs Standard Submitted Charges

Clinical Seniority & Experience Comparison

Dr. Duncan (34 Years) 34 Yrs

Ventura Specialty Average (25.7 Years) 25.7 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
99232 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes	25	24	$212.00	$80.30
99233 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes	24	17	$296.00	$120.58
99291 Critical care, first 30-74 minutes	23	20	$713.04	$213.55

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99233 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes	35	26	$312.86	$123.40
99291 Critical care, first 30-74 minutes	14	14	$680.36	$218.49
99232 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes	13	11	$212.00	$82.02
99223 Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes	12	11	$639.50	$179.97

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99232 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes	17	13	$295.06	$74.56
99233 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes	17	12	$378.94	$106.53
99223 Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes	11	11	$918.64	$207.50

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99232 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes	37	27	$565.00	$76.50
99223 Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes	18	18	$1376.00	$213.22
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	15	13	$597.00	$106.94
99291 Critical care, first 30-74 minutes	12	12	$1880.00	$232.05
99204 New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more	12	12	$1066.00	$145.84

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99232 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes	22	16	$565.00	$78.30
99204 New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more	15	15	$887.07	$178.45
99223 Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes	13	13	$1302.31	$217.73

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99213 Established patient office or other outpatient visit, typically 15 minutes	29	25	$375.00	$81.41
99223 Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes	24	23	$1376.00	$213.38
99204 New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more	23	23	$832.61	$177.51
99232 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes	18	18	$596.39	$76.75
99203 New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more	18	18	$729.00	$118.00
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	14	12	$597.00	$118.64

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	23	23	$859.04	$177.20
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	17	17	$565.24	$117.11
99213 Established patient office or other outpatient visit, typically 15 minutes	17	17	$361.00	$79.35

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	29	29	$863.03	$169.71
99213 Established patient office or other outpatient visit, typically 15 minutes	21	18	$323.29	$75.76
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	15	15	$520.13	$111.32
99223 Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes	13	13	$1233.46	$202.51
99212 Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more	12	12	$226.00	$45.74

Medical Specialties & State Licenses

CMS Verified: 2026-05-20

Surgery Primary Specialty

NUCC Taxonomy Code: 208600000X

State License CA 20A6490

A general surgeon has expertise related to the diagnosis - preoperative, operative and postoperative management - and management of complications of surgical conditions in the following areas: alimentary tract; abdomen; breast, skin and soft tissue; endocrine system; head and neck surgery; pediatric surgery; surgical critical care; surgical oncology; trauma and burns; and vascular surgery. General surgeons increasingly provide care through the use of minimally invasive and endoscopic techniques. Many general surgeons also possess expertise in transplantation surgery, plastic surgery and cardiothoracic surgery.

Hospital & Practice Group Affiliations

Ventura County Surgical Associates

300 Hillmont Ave, Ventura, CA 930031651

Phone: 8056526201

County Of Ventura

300 Hillmont Ave, Ventura, CA 930031651

Practice Associates & Co-Workers

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

12 Associated Practitioners

Teresa Hong , NP

Nurse Practitioner - Family

NPI 1013251396

Nurse Practitioner

Dr. Michael Williams , MD

Surgery

NPI 1114089562

Doctor of Medicine (M.D.)

Marcie Mofid , PA-C

Physician Assistant

NPI 1144486119

Physician Assistant (Certified)

Dr. Hailey Eisner , DO

Urology

NPI 1154771285

Doctor of Osteopathic Medicine (D.O.)

Dr. Jeremy Schweitzer , MD

Surgery

NPI 1174687297

Doctor of Medicine (M.D.)

Dr. Anthony Carden , MD

Surgery

NPI 1184943268

Doctor of Medicine (M.D.)

Career & Practice History Timeline

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

9 Historical Events

📍

Updated Practice Location May 20, 2026

Registered at 300 HILLMONT AVE STE 401, VENTURA, CA 930031651 (Tel: 8056526201)

📍

Updated Business Mailing Address May 20, 2026

Registered at 300 HILLMONT AVE STE 401, VENTURA, CA 930031651 (Tel: 8056526201)

🎓

Medical Taxonomy / Specialty Registered (Primary Specialty) May 20, 2026

Surgery (License #20A6490 in CA)

✅

NPI Profile Active July 08, 2007

NPI status registered as active in NPPES database

📍

Updated Practice Location July 08, 2007

Registered at 1000 MEDICAL CENTER BLVD, LAWRENCEVILLE, GA 300457694 (Tel: 6784423290)

📍

Updated Business Mailing Address July 08, 2007

Registered at 500 MEDICAL CENTER BLVD, SUITE 180, LAWRENCEVILLE, GA 300458708 (Tel: 6784423290)

👤

Provider Name / Credentials Updated July 08, 2007

Recorded as THOMAS DUNCAN, DO

🎓

Medical Taxonomy / Specialty Registered (Primary Specialty) July 08, 2007

Surgery (License #56536 in GA)

🟢

Initial NPI Registration & Enumeration January 11, 2007

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: 1316097439

Entity Type:

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

Enumeration Date: January 11, 2007

Last Update: May 20, 2026

Sole Proprietor: No

Update or Correct Profile

Mailing Address

300 Hillmont Ave Ste 401

Ventura, CA 930031651

Phone: 8056526201

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.