Daniel Patrick O'Brien
- Part D claims, 2024
- 55
- Hospital affiliations
- 3
- Industry payments
- $640
- Medical group
- 1
- State license
- 1
- Practice address
- 5767 W Century Blvd, Los Angeles, CA 90045
- Practice phone
- Call (310) 794-1276
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
UCLA Medical Plaza
Los Angeles, California
Find Daniel O'Brien'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.
Daniel Patrick O'Brien is an internist in Los Angeles, California
Daniel O'Brien practices at UCLA Medical Plaza in Los Angeles, California.
Daniel O'Brien's NPI, 1023512431, was assigned on March 20, 2018. Daniel O'Brien graduated from Keck School of Medicine of USC in 2018. Daniel O'Brien's California license number on file is A165839.
- NPI
- 1023512431NPI Registry (opens in a new tab)
- Medicare PAC ID
- 9830598010
- NPI enumeration date
- March 20, 2018
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Practice phone
- (310) 794-1276
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 34
- Medical school graduation
- 2018
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Daniel Patrick O'Brien practices at UCLA Medical Plaza in Los Angeles, California
Daniel O'Brien's primary practice is UCLA Medical Plaza, at 5767 W Century Blvd, Los Angeles, CA 90045 in Los Angeles County. The practice phone is (310) 794-1276.
- UCLA Medical Plaza5767 W Century Blvd, Los Angeles, CA 90045 · Los Angeles CountyPhone(310) 794-1276
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Daniel Patrick O'Brien is affiliated with 5 sites of care and 1 medical group
Daniel O'Brien's primary practice is UCLA Medical Plaza in Los Angeles, California. Daniel O'Brien is also affiliated with Ronald Reagan UCLA Medical Center. The medical group on file is UCLA Medical Group. Dmand AI also links Daniel O'Brien to 2 more hospitals and 1 group practice or clinic, each named with a free account.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Daniel Patrick O'Brien's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Daniel O'Brien practices, 4 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| UCLA Medical Plaza | Available with a free account |
| +4 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
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Daniel Patrick O'Brien is one of 16,751 internists in California
Internal medicine is Daniel O'Brien's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Daniel O'Brien is board certified in internal medicine by the American Board of Internal Medicine. Daniel O'Brien has a license on file in California.
Specialties and state licenses
- Internal medicine, CaliforniaPrimary
Internists near Daniel O'Brien
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
Daniel Patrick O'Brien's patients have a median age of 63
Across all payers, Dmand AI patient panel data puts Daniel O'Brien's median patient age at 63, with 52% women.
Daniel O'Brien's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 63
Patient panel by sex, all payers
- Women52%
- Men47%
Source: Dmand AI Patient Panel Data
Daniel Patrick O'Brien wrote 55 Medicare Part D claims in 2024
In 2024, Daniel O'Brien wrote 55 Medicare Part D claims for 14 patients. 87% of them were for generic drugs. CMS names the drug for 12 of them, across 1 drug with 11 or more claims each, at $84 in total drug cost.
Daniel O'Brien's Part D claims by kind of drug, 2024
- Generic48 claims87%
- Brand-name and other7 claims13%
Daniel O'Brien'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.
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
Daniel Patrick O'Brien offers telehealth to Medicare patients
Daniel O'Brien accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Daniel O'Brien as offering telehealth.
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Daniel Patrick O'Brien received $640 in industry payments from 2023 to 2024
CMS Open Payments shows 6 general payments to Daniel O'Brien from 5 drug and device companies from 2023 to 2024. Food and beverage make up the largest share, 63% of the total. Abbott Laboratories paid the most, $238.
General payments to Daniel O'Brien by program year, 2023 to 2024
General payments to Daniel O'Brien by kind, 2023 to 2024
- Food and beverage$40263%
- Education$23837%
Companies that paid Daniel O'Brien the most, 2023 to 2024
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Daniel Patrick O'Brien graduated from Keck School of Medicine of USC
Daniel O'Brien graduated from Keck School of Medicine of USC in 2018.
- Medical school
- Board certified in internal medicine
Source: Dmand AI Professional Profile Data
Sources for Daniel Patrick O'Brien'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 DataDmand AI Org Hierarchy Data |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel Data |
| 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 |
| 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 Daniel Patrick O'Brien
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Daniel Patrick O'Brien's NPI number?
Daniel Patrick O'Brien's NPI number is 1023512431. It was assigned on March 20, 2018, and it is active in the NPI Registry.
What does Daniel Patrick O'Brien specialize in?
Daniel Patrick O'Brien is an internist in Los Angeles, California. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Daniel Patrick O'Brien practice?
Daniel O'Brien practices at 5767 W Century Blvd, Los Angeles, CA 90045. Daniel O'Brien's primary practice is UCLA Medical Plaza in Los Angeles, California. Dmand AI also links Daniel O'Brien to 2 hospitals and 1 group practice or clinic.
What is Daniel Patrick O'Brien's office phone number?
The practice phone on file for Daniel O'Brien is (310) 794-1276.
What is Daniel Patrick O'Brien's medical license number?
Daniel O'Brien's California license number on file is A165839.
Which hospitals is Daniel Patrick O'Brien affiliated with?
Daniel O'Brien is affiliated with Ronald Reagan UCLA Medical Center. Dmand AI links Daniel O'Brien to 2 more hospitals.
What medical group is Daniel Patrick O'Brien part of?
Daniel O'Brien is linked to UCLA Medical Group.
Does Daniel Patrick O'Brien accept Medicare?
Yes. CMS lists Daniel O'Brien as accepting Medicare assignment.
Does Daniel Patrick O'Brien offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Daniel O'Brien as offering telehealth services.
Is Daniel Patrick O'Brien board certified?
Yes. Daniel O'Brien is board certified in internal medicine by the American Board of Internal Medicine.
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Where did Daniel Patrick O'Brien go to medical school?
Daniel O'Brien graduated from Keck School of Medicine of USC in 2018.
What drugs does Daniel Patrick O'Brien prescribe most?
In 2024 Medicare Part D data, Daniel O'Brien's most prescribed drugs by claims were Atorvastatin Calcium.
Has Daniel Patrick O'Brien received payments from drug or device companies?
CMS Open Payments shows $640 in general payments to Daniel O'Brien from 5 companies from 2023 to 2024. The largest total came from Abbott Laboratories.
How long has Daniel Patrick O'Brien been practicing?
Daniel O'Brien graduated from medical school in 2018, 8 years ago.
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