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- 300 Mason St., Vacaville, CA 95688
About Dr. O'connor
William T. O'Connor, M.D. is a healthcare provider in Vacaville, CA specializing in family medicine. William trained at University of Cincinnati College of Medicine, graduating in 1981. According to Medicare claims data, William cared for 379 Medicare patients across 974 services. The services billed most often include established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more, prolonged office or other outpatient evaluation and management service(s) beyond the maximum required time of the primary procedure which has been selected using total time on the date of the primary service; each additional 15 minutes by the physician or, and training for self-care or home management, each 15 minutes. This provider record is associated with NPI 1639127632.
Factual summary compiled by Guide.md from public records; not written by this provider.
Education & Training
Specialty
Credentials & Licensing
Medicare information
Exactly as CMS reports it (National Downloadable File, Opt-Out Affidavits, Order & Referring). Not an insurance directory; confirm coverage with the office.
Contact Information
- (707) 446-0422
- Email not available
Practice Locations
300 MASON ST.
Vacaville, CA 95688
Conditions Commonly Evaluated or Treated
Within Family Medicine generally. Availability varies by clinician, training and location — this profile has not been claimed, so nothing here is a personal claim by the provider.
Conditions
Most searched conditions
- Allergies
- Diabetes
- Flu
- Hypothyroidism
- Strep throat
- UTI
Cardiometabolic
Digestive
- Acid reflux
- IBS
Genitourinary and reproductive
Musculoskeletal and pain
Neurologic and behavioral
Respiratory and infectious
- Acute bronchitis
- Asthma
- Sinus infection
Skin
Common childhood and ear conditions
- Ear infection
- Pink eye
Pain & Joints
- Arthritis
- Back pain
Procedures & services
Most searched procedures
- Annual physical
- Blood test
- Flu shot
- Medicare wellness visit
- Sick visit
- TB test
- Well-woman exam
Preventive interventions
- Birth control counseling
- Smoking cessation counseling
Screening and testing
- Cholesterol screening
- Depression screening
- Diabetes and prediabetes screening
- EKG
Diagnostic Tests
- COVID-19 testing
- Rapid Strep and Flu Swabs
- Urine Drug Screen
Exams & Screenings
- Camp and School Physical
- Pre-Op Clearance Exam
Foot and Leg Pain
- Toenail Fungus Treatment
Heart & Circulation
Injections
- Immunotherapy
- Vitamin B12 Injections
Lungs & Breathing
Minor Procedures
- Burn and Wound Care
- Ingrown toenail removal
- Suture removal
Occupational Health
- DOT Physical
Office procedures
- Earwax removal
- Incision and drainage of an abscess
- Superficial foreign-body removal
Pain Management
- Joint injections
Preventive Care
- Chronic Illness Checkup
- Routine Vaccines
- Travel Vaccines And Consult
Respiratory
Senior Care
Sexual & Reproductive Health
- STD Swabs and Screening
Skin Procedures
- Cyst Removal
- Precancerous Sun Spot Freezing
- Skin Tag Removal
- Wart Removal
Sleep Health
- At-Home Sleep Study Order
Urgent Care Procedures
- Stitches and Laceration Repair
Wellness & Weight
- Weight Management Consult
Women's Health
- Hormone Replacement Therapy Consultation
Procedures Most Often Billed to Medicare
974 services · 379 patients · 10 distinct codes
| Procedure | Type | Code | Services | Compared with peers |
|---|---|---|---|---|
| Destruction of skin growth, 1-14 growths | Procedure | 17110 |
53 | More often than most peers in Family Medicine |
| Destruction of precancer skin growth, 2-14 growths | Procedure | 17003 |
36 | Less often than most peers in Family Medicine |
| Destruction of precancer skin growth, 1 growth | Procedure | 17000 |
27 | More often than most peers in Family Medicine |
| Destruction of precancer skin growth, 15 or more growths | Procedure | 17004 |
23 | Less often than most peers in Family Medicine |
| Training for self-care or home management, each 15 minutes | Treatment | 97535 |
112 | Too few peers to compare |
| Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more | Office visit | 99215 |
410 | More than most peers in Family Medicine |
| Prolonged office or other outpatient evaluation and management service(s) beyond the maximum required time of the primary procedure which has been selected using total time on the date of the primary service; each additional 15 minutes by the physician or | Billing code | G2212 |
170 | More than most peers in Family Medicine |
| Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more | Office visit | 99214 |
105 | As often as other peers in Family Medicine |
| Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more | Office visit | 99213 |
23 | Less often than most peers in Family Medicine |
| New patient office or other outpatient visit with a high level of medical decision making, if using time, 60 minutes or more | Office visit | 99205 |
15 | As often as other peers in Family Medicine |
Source: CMS Medicare public data. Shows how often procedures were billed — not quality of care or patient satisfaction.
Related providers
Connections drawn from the registry and from what providers have told us. A link here is not a referral or an endorsement.
Other family doctors in Vacaville 8
Same specialty, same city.
Trained at University of Cincinnati College of Medicine 8
Other providers in the same specialty who trained at the same institution.
Class of 1981 at University of Cincinnati College of Medicine 8
Providers who graduated from the same medical school in the same year.
More connections — 8 related providers in 1 group
Also performs Destruction of skin growth, 1-14 growths 8
Providers in CA who bill this service to Medicare most often.
Common questions
What does William T. O'Connor specialize in?
William T. O'Connor is a family doctor in Vacaville, CA. That is the designation recorded for this NPI in the federal registry, where it is listed as “Family Medicine”.
NPI registry
Where is William T. O'Connor located?
William T. O'Connor is listed at 300 Mason St., Vacaville, CA 95688. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
What is William T. O'Connor's phone number?
The number on file is (707) 446-0422. Contact the office directly to confirm availability and scheduling.
NPI registry
What is William T. O'Connor's NPI number?
William T. O'Connor's National Provider Identifier is 1639127632. It is issued by the Centers for Medicare & Medicaid Services and is unique and permanent — it does not change if they move practice.
NPI registry
Where did William T. O'Connor train?
William T. O'Connor attended University of Cincinnati College of Medicine, graduating in 1981. This comes from the CMS National Downloadable File.
CMS public data
How long has William T. O'Connor been practicing?
William T. O'Connor has 45 years experience. Calculated from a graduation year of 1981, reported in the CMS National Downloadable File.
CMS public data
What does William T. O'Connor do most often?
According to Medicare billing data, William T. O'Connor performs procedures including destruction of skin growth, 1-14 growths, destruction of precancer skin growth, 2-14 growths and destruction of precancer skin growth, 1 growth; provides treatments such as training for self-care or home management, each 15 minutes, alongside routine visits and testing. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Has William T. O'Connor confirmed this information?
Not yet. This profile is built from public federal data and has not been confirmed by William T. O'Connor. If this is you, claiming it is free.
Guide.md
Guide.md listings do not constitute medical advice or an endorsement.