Catherine Mary McMillan
- Medicare services, 2024
- 219
- Medicare patients, 2024
- 100
- Part D claims, 2024
- 647
- Hospital affiliations
- 1
- Industry payments
- $428
- Practice address
- 27700 Medical Center Rd, Mission Viejo, CA 92691
- Practice phone
- Call (949) 365-2447
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Mission Hospital - Unit
Acute Care Hospital-Unit · Mission Viejo, California
Find Catherine McMillan's professional email, personal email and mobile number
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Catherine Mary McMillan is an internist in Mission Viejo, California
Catherine McMillan practices at Mission Hospital - Unit in Mission Viejo, California.
Catherine McMillan's NPI, 1114580222, was assigned on April 16, 2019. Catherine McMillan holds California license 20A19880.
- NPI
- 1114580222NPI Registry (opens in a new tab)
- NPI enumeration date
- April 16, 2019
- NPI status
- Active
- Practice phone
- (949) 365-2447
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
- Estimated age
- 33
- Medical school graduation
- 2019
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Affiliation Data
Catherine Mary McMillan practices at Mission Hospital - Unit in Mission Viejo, California
Catherine McMillan's primary practice is Mission Hospital - Unit, at 27700 Medical Center Rd, Mission Viejo, CA 92691 in Orange County. The practice phone is (949) 365-2447.
- Mission Hospital - Unit27700 Medical Center Rd, Mission Viejo, CA 92691 · Orange CountyPhone(949) 365-2447
Source: Dmand AI Affiliation Data
Catherine Mary McMillan is affiliated with 2 sites of care and 1 medical group
Catherine McMillan's primary practice is Mission Hospital - Unit in Mission Viejo, California. The medical group on file is Paloma Medical Group. Dmand AI also links Catherine McMillan to 1 more group practice or clinic, named with a free account.
Source: Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Catherine Mary McMillan's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Catherine McMillan practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Mission Hospital - 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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Catherine Mary McMillan is one of 16,751 internists in California
Internal medicine is Catherine McMillan's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Catherine McMillan is licensed in California.
Specialties and state licenses
- Internal medicine, CaliforniaPrimary
Internists near Catherine McMillan
Counts of internists 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
Catherine Mary McMillan billed Medicare for 219 services in 2024
CMS data shows 219 Medicare services from Catherine McMillan across 5 procedure codes in 2024, for 100 Medicare patients. Medicare paid $21,168 for them. Every service was in an office.
Catherine McMillan's Medicare services by type, 2024
- Office and hospital visits122
- Other services97
Catherine McMillan compared with the California median for internists, 2024
- Catherine McMillan
- California median
- Medicare services
- 219vs 36139% below
- Medicare patients
- 100vs 15134% below
- Part D claims
- 219vs 42148% below
Medians across 15,815 internists in California with Dmand AI profiles that report each measure.
Catherine McMillan'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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Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Catherine Mary McMillan treated 100 Medicare patients in 2024, average age 74
CMS counts 100 Medicare patients who saw Catherine McMillan in 2024. The largest group is 65 to 74, with 45 patients. 64% of them have high cholesterol, and 61% have arthritis. Their average risk score is 1.17, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Catherine McMillan's median patient age at 73, with 59% women.
Catherine McMillan's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Catherine McMillan's Medicare patients by sex, 2024
- Women7676%
- Men2424%
Chronic conditions among Catherine McMillan's Medicare patients, 2024
- High cholesterol64%
- Arthritis61%
- High blood pressure59%
- Osteoporosis28%
- Anxiety22%
- Atrial fibrillation21%
- Ischemic heart disease20%
- Diabetes19%
Share of Medicare patients with each condition. A patient can have several.
Catherine McMillan's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 73
Patient panel by sex, all payers
- Women59%
- Men39%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Catherine Mary McMillan wrote 647 Medicare Part D claims in 2024
In 2024, Catherine McMillan wrote 647 Medicare Part D claims for 111 patients. 89% of them were for generic drugs. CMS names the drug for 219 of them, across 14 drugs with 11 or more claims each, at $19,351 in total drug cost.
Catherine McMillan's Part D claims by kind of drug, 2024
- Generic573 claims89%
- Brand-name and other74 claims11%
Catherine McMillan'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 Catherine McMillan's Part D claims, 2024
- Opioids4%26 of 647 claims
- Antibiotics5%30 of 647 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
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
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Catherine Mary McMillan received $428 in industry payments in 2024
CMS Open Payments shows 18 general payments to Catherine McMillan from 12 drug and device companies in 2024. Food and beverage make up the largest share, 100% of the total. Eli Lilly and Company paid the most, $113.
Companies that paid Catherine McMillan the most, 2024 to 2024
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Catherine Mary McMillan'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) |
| 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) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| 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 Catherine Mary McMillan
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Catherine Mary McMillan's NPI number?
Catherine Mary McMillan's NPI number is 1114580222. It was assigned on April 16, 2019, and it is active in the NPI Registry.
What does Catherine Mary McMillan specialize in?
Catherine Mary McMillan is an internist in Mission Viejo, California. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Catherine Mary McMillan practice?
Catherine McMillan practices at 27700 Medical Center Rd, Mission Viejo, CA 92691. Catherine McMillan's primary practice is Mission Hospital - Unit in Mission Viejo, California. Dmand AI also links Catherine McMillan to 1 group practice or clinic.
What is Catherine Mary McMillan's office phone number?
The practice phone on file for Catherine McMillan is (949) 365-2447.
What is Catherine Mary McMillan's medical license number?
Catherine McMillan holds California license 20A19880.
What medical group is Catherine Mary McMillan part of?
Catherine McMillan is linked to Paloma Medical Group.
Does Catherine Mary McMillan accept Medicare?
Yes. CMS data shows Catherine McMillan billed Medicare for 219 services in 2024.
How many Medicare patients does Catherine Mary McMillan see?
CMS counts 100 Medicare patients who saw Catherine McMillan in 2024, with an average age of 74.
What services does Catherine Mary McMillan bill to Medicare?
In 2024, Catherine McMillan's most billed Medicare services were office visit, established patient (99215), medicare service (G2212) and office visit, established patient (99214).
What drugs does Catherine Mary McMillan prescribe most?
In 2024 Medicare Part D data, Catherine McMillan's most prescribed drugs by claims were Rosuvastatin Calcium, Levothyroxine Sodium and Synthroid.
Has Catherine Mary McMillan received payments from drug or device companies?
CMS Open Payments shows $428 in general payments to Catherine McMillan from 12 companies from 2024 to 2024. The largest total came from Eli Lilly and Company.
How long has Catherine Mary McMillan been practicing?
Catherine McMillan graduated from medical school in 2019, 7 years ago.
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