Dr. Dennis J. Buchanan, MD
- Medicare services, 2024
- 99
- Medicare patients, 2024
- 96
- Part D claims, 2024
- 304
- Hospital affiliations
- 1
- Industry payments
- $122
- Practice address
- 101 Laguna Rd, Fullerton, CA 92835
- Practice phone
- Call (714) 449-4900
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Providence Medical Foundation
Fullerton, California
Find Dr. Buchanan's professional email, personal email and mobile number
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Dr. Dennis J. Buchanan is an OB-GYN in Fullerton, California
Dr. Buchanan practices at Providence Medical Foundation in Fullerton, California.
Dr. Buchanan's NPI, 1003864737, was assigned on May 5, 2006. Dr. Buchanan graduated from University of Southern California Keck School of Medicine in 1979. Dr. Buchanan holds California license G42457.
- NPI
- 1003864737NPI Registry (opens in a new tab)
- Medicare PAC ID
- 5890788079
- NPI enumeration date
- May 5, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (714) 449-4900
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 73
- Medical school graduation
- 1979
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Dennis J. Buchanan practices at Providence Medical Foundation in Fullerton, California
Dr. Buchanan's primary practice is Providence Medical Foundation, at 101 Laguna Rd, Fullerton, CA 92835 in Orange County. The practice phone is (714) 449-4900.
- Providence Medical Foundation101 Laguna Rd, Fullerton, CA 92835 · Orange CountyPhone(714) 449-4900
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Dennis J. Buchanan is affiliated with 3 sites of care and 1 medical group
Dr. Buchanan's primary practice is Providence Medical Foundation in Fullerton, California. Dr. Buchanan is also affiliated with Providence St. Jude Medical Center. The medical group on file is St. Jude Heritage Medical Group. Dmand AI also links Dr. Buchanan to 1 more group practice or clinic, named with a free account.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; and Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Dennis J. Buchanan's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Buchanan practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Providence Medical Foundation | Available with a free account |
| +2 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Dennis J. Buchanan is one of 4,642 OB-GYNs in California
Obstetrics and gynecology is Dr. Buchanan's primary specialty in the NPI Registry, under taxonomy code 207V00000X. Dr. Buchanan is licensed in California.
Specialties and state licenses
- Obstetrics and gynecology, CaliforniaPrimary
OB-GYNs near Dr. Buchanan
Counts of OB-GYNs 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. Dennis J. Buchanan billed Medicare for 99 services in 2024
CMS data shows 99 Medicare services from Dr. Buchanan across 3 procedure codes in 2024, for 96 Medicare patients. Medicare paid $5,937 for them. Every service was in an office.
Dr. Buchanan's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 172024: 56229%
- Other services
- 2023: 312024: 4339%
Dr. Buchanan compared with the California median for OB-GYNs, 2024
- Dr. Buchanan
- California median
- Medicare services
- 99vs 5871% above
- Medicare patients
- 96vs 5285% above
- Part D claims
- 215vs 356.1 times
Medians across 3,823 OB-GYNs in California with Dmand AI profiles that report each measure.
Dr. Buchanan'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.
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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Buchanan and other OB-GYNs in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Dennis J. Buchanan treated 96 Medicare patients in 2024, average age 72
CMS counts 96 Medicare patients who saw Dr. Buchanan in 2024. The largest group is 65 to 74, with 60 patients. 75% of them have high cholesterol, and 56% have high blood pressure. 15% are also on Medicaid. Their average risk score is 0.97, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Buchanan's median patient age at 42, with 99% women.
Dr. Buchanan's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Chronic conditions among Dr. Buchanan's Medicare patients, 2024
- High cholesterol75%
- High blood pressure56%
- Arthritis47%
- Osteoporosis29%
- Mood disorders24%
- Depression22%
- Anxiety19%
- Diabetes16%
Share of Medicare patients with each condition. A patient can have several.
Dr. Buchanan's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 42
Patient panel by sex, all payers
- Women99%
- Men0%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Dennis J. Buchanan wrote 304 Medicare Part D claims in 2024
In 2024, Dr. Buchanan wrote 304 Medicare Part D claims for 94 patients. 83% of them were for generic drugs. CMS names the drug for 215 of them, across 9 drugs with 11 or more claims each, at $19,669 in total drug cost. In 2023, CMS named 197 claims across 9 drugs.
Dr. Buchanan's Part D claims by kind of drug, 2024
- Generic251 claims83%
- Brand-name53 claims17%
Dr. Buchanan's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Dr. Buchanan's Part D claims, 2024
- Antibiotics4%11 of 304 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 1972024: 2159%
Drugs named by CMS: 9 in 2024, 9 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
How Dr. Dennis J. Buchanan takes part in Medicare
Dr. Buchanan accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Removal of the uterus: 1 to 10 procedures (CMS shows small counts as a range)
Sources: Doctors and Clinicians National Downloadable File (CMS); and Doctors and Clinicians Utilization Data (CMS)
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Dr. Dennis J. Buchanan received $122 in industry payments from 2019 to 2025
CMS Open Payments shows 6 general payments to Dr. Buchanan from 4 drug and device companies from 2019 to 2025. Food and beverage make up the largest share, 86% of the total. Bayer HealthCare Pharmaceuticals Inc. paid the most, $66.
General payments to Dr. Buchanan by program year, 2019 to 2025
General payments to Dr. Buchanan by kind, 2019 to 2025
- Food and beverage$10586%
- Education$1714%
Companies that paid Dr. Buchanan the most, 2019 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Dennis J. Buchanan graduated from University of Southern California Keck School of Medicine
Dr. Buchanan graduated from University of Southern California Keck School of Medicine in 1979.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Dennis J. Buchanan'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 | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice DataDmand 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) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - 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)Doctors and Clinicians Utilization Data (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 |
| 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. Dennis J. Buchanan
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. Dennis J. Buchanan's NPI number?
Dr. Dennis J. Buchanan's NPI number is 1003864737. It was assigned on May 5, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Dennis J. Buchanan?
Dr. Dennis J. Buchanan is an OB-GYN in Fullerton, California. The primary specialty in the NPI Registry is Obstetrics & Gynecology Physician (taxonomy code 207V00000X).
Where does Dr. Dennis J. Buchanan practice?
Dr. Buchanan practices at 101 Laguna Rd, Fullerton, CA 92835. Dr. Buchanan's primary practice is Providence Medical Foundation in Fullerton, California. Dmand AI also links Dr. Buchanan to 1 group practice or clinic.
What is Dr. Dennis J. Buchanan's office phone number?
The practice phone on file for Dr. Buchanan is (714) 449-4900.
What is Dr. Dennis J. Buchanan's medical license number?
Dr. Buchanan holds California license G42457.
Which hospitals is Dr. Dennis J. Buchanan affiliated with?
Dr. Buchanan is affiliated with Providence St. Jude Medical Center.
What medical group is Dr. Dennis J. Buchanan part of?
Dr. Buchanan is linked to St. Jude Heritage Medical Group.
Does Dr. Dennis J. Buchanan accept Medicare?
Yes. CMS data shows Dr. Buchanan billed Medicare for 99 services in 2024, and Dr. Buchanan accepts Medicare assignment.
How many Medicare patients does Dr. Dennis J. Buchanan see?
CMS counts 96 Medicare patients who saw Dr. Buchanan in 2024, with an average age of 72.
What services does Dr. Dennis J. Buchanan bill to Medicare?
In 2024, Dr. Buchanan's most billed Medicare services were medicare service (G0101), office visit, established patient (99213) and office visit, new patient (99203).
Show 4 more questionsShow fewer questions
Where did Dr. Dennis J. Buchanan go to medical school?
Dr. Buchanan graduated from University of Southern California Keck School of Medicine in 1979.
What drugs does Dr. Dennis J. Buchanan prescribe most?
In 2024 Medicare Part D data, Dr. Buchanan's most prescribed drugs by claims were Estradiol, Clobetasol Propionate and Medroxyprogesterone Acetate.
Has Dr. Dennis J. Buchanan received payments from drug or device companies?
CMS Open Payments shows $122 in general payments to Dr. Buchanan from 4 companies from 2019 to 2025. The largest total came from Bayer HealthCare Pharmaceuticals Inc.
How long has Dr. Dennis J. Buchanan been practicing?
Dr. Buchanan graduated from medical school in 1979, 47 years ago.
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