Dr. Denise A.d. Phan, MD
- Medicare services, 2024
- 5,812
- Medicare patients, 2024
- 138
- Part D claims, 2024
- 4,079
- Industry payments
- $6,048
- Affiliated sites
- 4
- Practice address
- 15243 Vanowen St, Vannuys, CA 91405
- Practice phone
- Call (818) 787-2020
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Mazzocco Ambulatory Surgical Center (Vanowen St)
Surgery Center - Not Medicare-Certified · Vannuys, California
Find Dr. Phan'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. Denise A.d. Phan is an internist in Vannuys, California
Dr. Phan practices at Mazzocco Ambulatory Surgical Center (Vanowen St) in Vannuys, California.
Dr. Phan's NPI, 1477656395, was assigned on September 6, 2006. Dr. Phan graduated from David Geffen School of Medicine at UCLA in 1990. Dr. Phan's California license number on file is G73973.
- NPI
- 1477656395NPI Registry (opens in a new tab)
- Medicare PAC ID
- 6305994583
- NPI enumeration date
- September 6, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Practice phone
- (818) 787-2020
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
- Estimated age
- 62
- Medical school graduation
- 1990
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Denise A.d. Phan practices at Mazzocco Ambulatory Surgical Center (Vanowen St) in Vannuys, California
Dr. Phan's primary practice is Mazzocco Ambulatory Surgical Center (Vanowen St), at 15243 Vanowen St, Vannuys, CA 91405. The practice phone is (818) 787-2020.
- Mazzocco Ambulatory Surgical Center (Vanowen St)15243 Vanowen St, Vannuys, CA 91405Phone(818) 787-2020
Source: Dmand AI Affiliation Data
Dr. Denise A.d. Phan is affiliated with 4 sites of care and 1 medical group
Dr. Phan's primary practice is Mazzocco Ambulatory Surgical Center (Vanowen St) in Vannuys, California. The medical group on file is Century Medical Group. Dmand AI also links Dr. Phan to 2 more home health agencies and 1 group practice or clinic, each named with a free account.
Source: Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Denise A.d. Phan's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Phan practices, 4 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Mazzocco Ambulatory Surgical Center (Vanowen St) | Available with a free account |
| +3 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Denise A.d. 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 has a license on file in California.
Specialties and state licenses
- Internal medicine, CaliforniaPrimary
Clinical focus
Dmand AI lists acid reflux, acne, acute gastroduodenitis, acute sinusitis, anxiety, arthritis, asthma and atrial fibrillation and flutter among the conditions Dr. Phan treats.
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. Denise A.d. Phan billed Medicare for 5,812 services in 2024
CMS data shows 5,812 Medicare services from Dr. Phan across 56 procedure codes in 2024, for 138 Medicare patients. Medicare paid $144,513 for them. Every service was in an office.
Dr. Phan's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Lab and pathology
- 2023: 3,4022024: 3,4732%
- Office and hospital visits
- 2023: 6842024: 1,948185%
- Surgery
- 2023: 2232024: 2272%
- Tests and treatments
- 2023: 972024: 10811%
- Other services
- 2023: 342024: 5665%
Dr. Phan compared with the California median for internists, 2024
- Dr. Phan
- California median
- Medicare services
- 5,812vs 36116.1 times
- Medicare patients
- 138vs 1519% below
- Part D claims
- 3,402vs 4218.1 times
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.
Need commercial claims for Dr. Phan?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Phan and other internists in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Denise A.d. Phan treated 138 Medicare patients in 2024, average age 72
CMS counts 138 Medicare patients who saw Dr. Phan in 2024. The largest group is 65 to 74, with 57 patients. 75% of them have high cholesterol, and 72% have high blood pressure. 49% are also on Medicaid. Their average risk score is 1.24, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Phan's median patient age at 62, with 66% women.
Dr. Phan's Medicare patients by age, 2024
Dr. Phan's Medicare patients by sex, 2024
- Women10375%
- Men3525%
Chronic conditions among Dr. Phan's Medicare patients, 2024
- High cholesterol75%
- High blood pressure72%
- Arthritis43%
- Diabetes38%
- Anxiety33%
- Mood disorders26%
- Chronic kidney disease23%
- Depression20%
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 62
Patient panel by sex, all payers
- Women66%
- Men33%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Denise A.d. Phan wrote 4,079 Medicare Part D claims in 2024
In 2024, Dr. Phan wrote 4,079 Medicare Part D claims for 210 patients. 88% of them were for generic drugs. CMS names the drug for 3,402 of them, across 99 drugs with 11 or more claims each, at $294,843 in total drug cost. In 2023, CMS named 3,005 claims across 94 drugs.
Dr. Phan's Part D claims by kind of drug, 2024
- Generic3,602 claims88%
- Brand-name461 claims11%
- Other16 claims0%
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
- Opioids4%167 of 4,079 claims
- Antibiotics2%74 of 4,079 claims
- Antipsychotics, patients 65 and over1%35 of 4,079 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: 3,0052024: 3,40213%
Drugs named by CMS: 99 in 2024, 94 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. Denise A.d. Phan offers telehealth to Medicare patients
Dr. Phan accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Phan as offering telehealth.
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. Denise A.d. Phan received $6,048 in industry payments from 2016 to 2025
CMS Open Payments shows 237 general payments to Dr. Phan from 45 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 80% of the total. Biohaven Pharmaceuticals, Inc. paid the most, $1,263.
General payments to Dr. Phan by program year, 2016 to 2025
General payments to Dr. Phan by kind, 2016 to 2025
- Food and beverage$4,84880%
- Consulting fees$1,20020%
Companies that paid Dr. Phan the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Denise A.d. Phan graduated from David Geffen School of Medicine at UCLA
Dr. Phan graduated from David Geffen School of Medicine at UCLA in 1990.
- Medical school
Source: Dmand AI Professional Profile Data
Dr. Denise A.d. Phan accepts plans from 8 insurance carriers
Dr. Phan is in network with 8 carriers, including Aetna, Blue Cross Blue Shield of Michigan and Blue Cross Blue Shield of Massachusetts. Medicare plans come from the most carriers, 7. Check the plan with the practice before a visit.
- Aetna
- Blue Cross Blue Shield of Michigan
- Blue Cross Blue Shield of Massachusetts
- Elevance
- HCSC
- Molina
- CMS Medicare
- Humana
Plan types Dr. Phan accepts, by number of carriers
- Medicare7
- PPO5
- HMO4
- POS2
- EPO1
Source: Dmand AI Insurance Network Data
Sources for Dr. Denise A.d. Phan'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) |
| 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. Denise A.d. Phan
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. Denise A.d. Phan's NPI number?
Dr. Denise A.d. Phan's NPI number is 1477656395. It was assigned on September 6, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Denise A.d. Phan?
Dr. Denise A.d. Phan is an internist in Vannuys, California. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Denise A.d. Phan practice?
Dr. Phan practices at 15243 Vanowen St, Vannuys, CA 91405. Dr. Phan's primary practice is Mazzocco Ambulatory Surgical Center (Vanowen St) in Vannuys, California. Dmand AI also links Dr. Phan to 2 home health agencies and 1 group practice or clinic.
What is Dr. Denise A.d. Phan's office phone number?
The practice phone on file for Dr. Phan is (818) 787-2020.
What is Dr. Denise A.d. Phan's medical license number?
Dr. Phan's California license number on file is G73973.
What medical group is Dr. Denise A.d. Phan part of?
Dr. Phan is linked to Century Medical Group.
Does Dr. Denise A.d. Phan accept Medicare?
Yes. CMS data shows Dr. Phan billed Medicare for 5,812 services in 2024, and Dr. Phan accepts Medicare assignment.
Does Dr. Denise A.d. Phan offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Dr. Phan as offering telehealth services.
How many Medicare patients does Dr. Denise A.d. Phan see?
CMS counts 138 Medicare patients who saw Dr. Phan in 2024, with an average age of 72.
What services does Dr. Denise A.d. Phan bill to Medicare?
In 2024, Dr. Phan's most billed Medicare services were care management and other visits (99458), care management and other visits (99439) and office visit, established patient (99214).
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Where did Dr. Denise A.d. Phan go to medical school?
Dr. Phan graduated from David Geffen School of Medicine at UCLA in 1990.
What drugs does Dr. Denise A.d. Phan prescribe most?
In 2024 Medicare Part D data, Dr. Phan's most prescribed drugs by claims were Atorvastatin Calcium, Amlodipine Besylate and Metformin HCl.
Has Dr. Denise A.d. Phan received payments from drug or device companies?
CMS Open Payments shows $6,048 in general payments to Dr. Phan from 45 companies from 2016 to 2025. The largest total came from Biohaven Pharmaceuticals, Inc.
How long has Dr. Denise A.d. Phan been practicing?
Dr. Phan graduated from medical school in 1990, 36 years ago.
What insurance does Dr. Denise A.d. Phan accept?
Dr. Phan is in network with 8 carriers, including Aetna, Blue Cross Blue Shield of Michigan and Blue Cross Blue Shield of Massachusetts. Medicare plans come from the most carriers, 7. Check the plan with the practice before a visit.
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