Dr. Ellyn M. Phan, MD
- Medicare services, 2024
- 91
- Medicare patients, 2024
- 46
- Part D claims, 2024
- 693
- MIPS score, 2024
- 87
- Hospital affiliations
- 1
- Practice address
- 17360 Brookhurst St, Fountain Valley, CA 92708
- Practice phone
- Call (877) 696-3622
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Memorialcare Medical Foundation
Fountain Valley, California
Find Dr. Phan's professional email, personal email and mobile number
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Dr. Ellyn M. Phan is an internist in Fountain Valley, California
Dr. Phan practices at Memorialcare Medical Foundation in Fountain Valley, California.
Dr. Phan's NPI, 1972035350, was assigned on April 3, 2017. Dr. Phan holds California license A169745.
- NPI
- 1972035350NPI Registry (opens in a new tab)
- Medicare PAC ID
- 8224449335
- NPI enumeration date
- April 3, 2017
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (877) 696-3622
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
- Estimated age
- 35
- Medical school graduation
- 2017
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Ellyn M. Phan practices at Memorialcare Medical Foundation in Fountain Valley, California
Dr. Phan's primary practice is Memorialcare Medical Foundation, at 17360 Brookhurst St, Fountain Valley, CA 92708 in Orange County. The practice phone is (877) 696-3622.
- Memorialcare Medical Foundation17360 Brookhurst St, Fountain Valley, CA 92708 · Orange CountyPhone(877) 696-3622
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Ellyn M. Phan is affiliated with 3 sites of care and 5 medical groups
Dr. Phan's primary practice is Memorialcare Medical Foundation in Fountain Valley, California. Dr. Phan is also affiliated with Long Beach Medical Center. The medical group on file is MemorialCare Medical Group. Dmand AI also links Dr. Phan to 4 more medical groups and 1 group practice or clinic, each 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. Ellyn M. Phan's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Phan practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Memorialcare Medical Foundation | Available with a free account |
| +2 more sites and 4 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Ellyn M. Phan is one of 16,751 internists in California
Internal medicine is Dr. Phan's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Phan is licensed in California.
Specialties and state licenses
- Internal medicine, CaliforniaPrimary
Internists near Dr. Phan
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
Dr. Ellyn M. Phan billed Medicare for 91 services in 2024
CMS data shows 91 Medicare services from Dr. Phan across 3 procedure codes in 2024, for 46 Medicare patients. Medicare paid $3,203 for them. Every service was in an office.
Dr. Phan's Medicare services by type, 2021 to 2024
- 2021
- 2024
- Office and hospital visits
- 2021: 5232024: 3493%
- Other services
- 2021: 02024: 33
- Surgery
- 2021: 02024: 24
Dr. Phan compared with the California median for internists, 2024
- Dr. Phan
- California median
- Medicare services
- 91vs 36175% below
- Medicare patients
- 46vs 15170% below
- Part D claims
- 278vs 42134% below
Medians across 15,815 internists in California with Dmand AI profiles that report each measure.
Dr. Phan'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
Dr. Ellyn M. Phan treated 46 Medicare patients in 2024, average age 72
CMS counts 46 Medicare patients who saw Dr. Phan in 2024. The largest group is 65 to 74, with 26 patients. 70% of them have high blood pressure, and 70% have high cholesterol. Their average risk score is 0.75, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Phan's median patient age at 43, with 70% women.
Dr. Phan's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Phan's Medicare patients by sex, 2024
- Women2963%
- Men1737%
Chronic conditions among Dr. Phan's Medicare patients, 2024
- High blood pressure70%
- High cholesterol70%
- Arthritis33%
- Diabetes26%
Share of Medicare patients with each condition. A patient can have several.
Dr. Phan's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 43
Patient panel by sex, all payers
- Women70%
- Men29%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Ellyn M. Phan wrote 693 Medicare Part D claims in 2024
In 2024, Dr. Phan wrote 693 Medicare Part D claims for 217 patients. 88% of them were for generic drugs. CMS names the drug for 278 of them, across 12 drugs with 11 or more claims each, at $2,230 in total drug cost. In 2023, CMS named 552 claims across 22 drugs.
Dr. Phan's Part D claims by kind of drug, 2024
- Generic607 claims88%
- Brand-name and other86 claims12%
Dr. Phan'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. Phan's Part D claims, 2024
- Opioids3%18 of 693 claims
- Antibiotics6%43 of 693 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: 5522024: 27850%
Drugs named by CMS: 12 in 2024, 22 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
Dr. Ellyn M. Phan scored 87 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 87 out of 100 for Dr. Phan for performance year 2024, reported as part of a group. Dr. Phan accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Dr. Phan's MIPS scores, performance year 2024
- 87of 100Final score
- 81.2of 100Quality
- 100of 100Promoting Interoperability
- 40of 100Improvement Activities
- 72of 100Cost
Each score is out of 100. The final score weighs the categories CMS scored for this clinician.
Sources: Doctors and Clinicians National Downloadable File (CMS); and Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026
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Dr. Ellyn M. Phan received $628 in industry payments from 2024 to 2025
CMS Open Payments shows 11 general payments to Dr. Phan from 8 drug and device companies from 2024 to 2025. Food and beverage make up the largest share, 100% of the total. Phathom Pharmaceuticals, Inc. paid the most, $125.
General payments to Dr. Phan by program year, 2024 to 2025
Companies that paid Dr. Phan the most, 2024 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Dr. Ellyn M. Phan's profile data
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Ellyn M. Phan
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What is Dr. Ellyn M. Phan's NPI number?
Dr. Ellyn M. Phan's NPI number is 1972035350. It was assigned on April 3, 2017, and it is active in the NPI Registry.
What kind of doctor is Dr. Ellyn M. Phan?
Dr. Ellyn M. Phan is an internist in Fountain Valley, California. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Ellyn M. Phan practice?
Dr. Phan practices at 17360 Brookhurst St, Fountain Valley, CA 92708. Dr. Phan's primary practice is Memorialcare Medical Foundation in Fountain Valley, California. Dmand AI also links Dr. Phan to 4 medical groups and 1 group practice or clinic.
What is Dr. Ellyn M. Phan's office phone number?
The practice phone on file for Dr. Phan is (877) 696-3622.
What is Dr. Ellyn M. Phan's medical license number?
Dr. Phan holds California license A169745.
Which hospitals is Dr. Ellyn M. Phan affiliated with?
Dr. Phan is affiliated with Long Beach Medical Center.
What medical group is Dr. Ellyn M. Phan part of?
Dr. Phan is linked to MemorialCare Medical Group. Dmand AI links Dr. Phan to 4 more medical groups.
Does Dr. Ellyn M. Phan accept Medicare?
Yes. CMS data shows Dr. Phan billed Medicare for 91 services in 2024, and Dr. Phan accepts Medicare assignment.
What is Dr. Ellyn M. Phan's MIPS score?
Dr. Phan's MIPS final score for performance year 2024 is 87 out of 100, reported as part of a group.
How many Medicare patients does Dr. Ellyn M. Phan see?
CMS counts 46 Medicare patients who saw Dr. Phan in 2024, with an average age of 72.
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What services does Dr. Ellyn M. Phan bill to Medicare?
In 2024, Dr. Phan's most billed Medicare services were office visit, established patient (99213), medicare service (G2211) and surgery: heart and blood vessels (36415).
What drugs does Dr. Ellyn M. Phan prescribe most?
In 2024 Medicare Part D data, Dr. Phan's most prescribed drugs by claims were Amlodipine Besylate, Atorvastatin Calcium and Rosuvastatin Calcium.
Has Dr. Ellyn M. Phan received payments from drug or device companies?
CMS Open Payments shows $628 in general payments to Dr. Phan from 8 companies from 2024 to 2025. The largest total came from Phathom Pharmaceuticals, Inc.
How long has Dr. Ellyn M. Phan been practicing?
Dr. Phan graduated from medical school in 2017, 9 years ago.
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