Dr. John Byron Maccarthy, MD
- Medicare services, 2024
- 82
- Medicare patients, 2024
- 175
- Hospital affiliations
- 2
- Industry payments
- $1,658
- Medical group
- 1
- Practice address
- 101 E. Valencia Mesa Drive, Fullerton, CA 92835
- Practice phone
- Call (714) 578-8706
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
St. Jude Medical Center - Unit
Acute Care Hospital-Unit · Fullerton, California
Find Dr. Maccarthy's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. John Byron Maccarthy is an anesthesiologist in Fullerton, California
Dr. Maccarthy practices at St. Jude Medical Center - Unit in Fullerton, California.
Dr. Maccarthy's NPI, 1013969591, was assigned on May 16, 2006. Dr. Maccarthy graduated from The Robert Larner, M.D. College of Medicine in 1986. Dr. Maccarthy holds California license G67046.
- NPI
- 1013969591NPI Registry (opens in a new tab)
- Medicare PAC ID
- 5597650168
- NPI enumeration date
- May 16, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (714) 578-8706
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 66
- Medical school graduation
- 1986
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. John Byron Maccarthy practices at St. Jude Medical Center - Unit in Fullerton, California
Dr. Maccarthy's primary practice is St. Jude Medical Center - Unit, at 101 E. Valencia Mesa Drive, Fullerton, CA 92835 in Orange County. The practice phone is (714) 578-8706.
- St. Jude Medical Center - Unit101 E. Valencia Mesa Drive, Fullerton, CA 92835 · Orange CountyPhone(714) 578-8706
Source: Dmand AI Affiliation Data
Dr. John Byron Maccarthy is affiliated with 2 sites of care and 1 medical group
Dr. Maccarthy's primary practice is St. Jude Medical Center - Unit in Fullerton, California. Dr. Maccarthy is also affiliated with Providence St. Jude Medical Center. The medical group on file is Allied Anesthesia Medical Group.
Source: Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. John Byron Maccarthy's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Maccarthy practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| St. Jude Medical Center - Unit | Available with a free account |
| +1 more affiliated site | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. John Byron Maccarthy is one of 6,593 anesthesiologists in California
Anesthesiology is Dr. Maccarthy's primary specialty in the NPI Registry, under taxonomy code 207L00000X. Dr. Maccarthy is board certified in anesthesiology by the American Board of Anesthesiology. Dr. Maccarthy is licensed in California.
Specialties and state licenses
- Anesthesiology, CaliforniaPrimary
Anesthesiologists near Dr. Maccarthy
Counts of anesthesiologists with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. John Byron Maccarthy billed Medicare for 82 services in 2024
CMS data shows 82 Medicare services from Dr. Maccarthy across 4 procedure codes in 2024, for 175 Medicare patients. Medicare paid $9,610 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Maccarthy's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Anesthesia
- 2023: 672024: 661%
- Surgery
- 2023: 132024: 1623%
- Imaging
- 2023: 142024: 0100%
Dr. Maccarthy compared with the California median for anesthesiologists, 2024
- Dr. Maccarthy
- California median
- Medicare services
- 82vs 7214% above
- Medicare patients
- 175vs 14322% above
Medians across 5,562 anesthesiologists in California with Dmand AI profiles that report each measure.
Dr. Maccarthy's most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
Need commercial claims for Dr. Maccarthy?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Maccarthy and other anesthesiologists in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. John Byron Maccarthy treated 175 Medicare patients in 2024, average age 76
CMS counts 175 Medicare patients who saw Dr. Maccarthy in 2024. The largest group is 65 to 74, with 70 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 19% are also on Medicaid. Their average risk score is 1.82, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Dr. Maccarthy's median patient age at 69, with 55% women.
Dr. Maccarthy's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Maccarthy's Medicare patients by sex, 2024
- Women8549%
- Men9051%
Chronic conditions among Dr. Maccarthy's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis62%
- Diabetes41%
- Chronic kidney disease38%
- Atrial fibrillation25%
- Heart failure25%
- Cancer23%
Share of Medicare patients with each condition. A patient can have several.
Dr. Maccarthy's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 69
Patient panel by sex, all payers
- Women55%
- Men45%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
How Dr. John Byron Maccarthy takes part in Medicare
Dr. Maccarthy accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. John Byron Maccarthy received $1,658 in industry payments from 2016 to 2024
CMS Open Payments shows 20 general payments to Dr. Maccarthy from 13 drug and device companies from 2016 to 2024. Food and beverage make up the largest share, 99% of the total. Merck Sharp & Dohme Corporation paid the most, $285.
General payments to Dr. Maccarthy by program year, 2016 to 2024
General payments to Dr. Maccarthy by kind, 2016 to 2024
- Food and beverage$1,64899%
- Travel and lodging$101%
Companies that paid Dr. Maccarthy the most, 2016 to 2024
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. John Byron Maccarthy graduated from The Robert Larner, M.D. College of Medicine
Dr. Maccarthy graduated from The Robert Larner, M.D. College of Medicine in 1986.
- Medical school
- Board certified in anesthesiology
Source: Dmand AI Professional Profile Data
Dr. John Byron Maccarthy accepts plans from 1 insurance carrier
Dr. Maccarthy is in network with 1 carrier, including CMS Medicare. Medicare plans come from the most carriers, 1. Check the plan with the practice before a visit.
- CMS Medicare
Source: Dmand AI Insurance Network Data
Sources for Dr. John Byron Maccarthy's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| Insurance carriers and plan types | Dmand AI Insurance Network Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. John Byron Maccarthy
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. John Byron Maccarthy's NPI number?
Dr. John Byron Maccarthy's NPI number is 1013969591. It was assigned on May 16, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. John Byron Maccarthy?
Dr. John Byron Maccarthy is an anesthesiologist in Fullerton, California. The primary specialty in the NPI Registry is Anesthesiology Physician (taxonomy code 207L00000X).
Where does Dr. John Byron Maccarthy practice?
Dr. Maccarthy practices at 101 E. Valencia Mesa Drive, Fullerton, CA 92835. Dr. Maccarthy's primary practice is St. Jude Medical Center - Unit in Fullerton, California.
What is Dr. John Byron Maccarthy's office phone number?
The practice phone on file for Dr. Maccarthy is (714) 578-8706.
What is Dr. John Byron Maccarthy's medical license number?
Dr. Maccarthy holds California license G67046.
Which hospitals is Dr. John Byron Maccarthy affiliated with?
Dr. Maccarthy is affiliated with Providence St. Jude Medical Center. Dmand AI links Dr. Maccarthy to 1 more hospital.
What medical group is Dr. John Byron Maccarthy part of?
Dr. Maccarthy is linked to Allied Anesthesia Medical Group.
Does Dr. John Byron Maccarthy accept Medicare?
Yes. CMS data shows Dr. Maccarthy billed Medicare for 82 services in 2024, and Dr. Maccarthy accepts Medicare assignment.
How many Medicare patients does Dr. John Byron Maccarthy see?
CMS counts 175 Medicare patients who saw Dr. Maccarthy in 2024, with an average age of 76.
Is Dr. John Byron Maccarthy board certified?
Yes. Dr. Maccarthy is board certified in anesthesiology by the American Board of Anesthesiology.
Show 5 more questionsShow fewer questions
What services does Dr. John Byron Maccarthy bill to Medicare?
In 2024, Dr. Maccarthy's most billed Medicare services were anesthesia (00731), anesthesia (00142) and surgery: brain, spine and nerves (62322).
Where did Dr. John Byron Maccarthy go to medical school?
Dr. Maccarthy graduated from The Robert Larner, M.D. College of Medicine in 1986.
Has Dr. John Byron Maccarthy received payments from drug or device companies?
CMS Open Payments shows $1,658 in general payments to Dr. Maccarthy from 13 companies from 2016 to 2024. The largest total came from Merck Sharp & Dohme Corporation.
How long has Dr. John Byron Maccarthy been practicing?
Dr. Maccarthy graduated from medical school in 1986, 40 years ago.
What insurance does Dr. John Byron Maccarthy accept?
Dr. Maccarthy is in network with 1 carrier, including CMS Medicare. Medicare plans come from the most carriers, 1. Check the plan with the practice before a visit.
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