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DANIEL O'BRIEN
NPI 1023512431
Internal Medicine - Cardiovascular Disease in Rolling Hills Estates, CA

Active since March 20, 2018PECOS EnrolledAccepts Medicare Assignment
501 DEEP VALLEY DR STE 100, ROLLING HILLS ESTATES, CA 90274(310) 303-3953(310) 303-7903 Get Directions Write a Review

NPPES record last updated: March 25, 2026. Verified against the NPPES registry weekly; last sync: August 16, 2026.

Record update history: Mar 25, 2026, Sep 18, 2025, Jul 19, 2022 and 4 more (7 updates tracked since 2018).

About Daniel O'brien NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DANIEL O'BRIEN (NPI 1023512431) is an individual cardiovascular disease provider in Rolling Hills Estates, California, licensed in California (A165839) and active in the NPI registry since March 2018. He is enrolled in Medicare PECOS and is a graduate of University Of Southern California Keck School Of Medicine (2018).

NPPES Registry Identity

NPI1023512431
Entity TypeIndividualMale
Primary Taxonomy207RC0000X
Provider Legal NameDANIEL O'BRIEN
Location Address501 DEEP VALLEY DR STE 100Rolling Hills Estates, CA 90274-7606
Mailing Address5767 W Century Blvd Ste 400Los Angeles, CA 90045-5631
Phone(310) 303-3953
Fax(310) 303-7903
Sole ProprietorYes
Medical School CMSUniversity Of Southern California Keck School Of MedicineGraduated 2018
Enumeration DateMarch 20, 2018
Last NPPES UpdateMarch 25, 20267 updates tracked since enumeration
NPPES CertifiedMarch 25, 2026
✔ NPI 1023512431 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal Medicine · Cardiovascular DiseaseAllopathic & Osteopathic Physicians
Taxonomy Code207RC0000X
License✔ Licensed in CA · A165839
Definition
An internist who specializes in diseases of the heart and blood vessels and manages complex cardiac conditions such as heart attacks and life-threatening, abnormal heartbeat rhythms.
501 DEEP VALLEY DR STE 100, Rolling Hills Estates, CA 90274
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Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Daniel O'brien is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID9830598010
PECOS Enrollment IDI20210519002632
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 90274 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$142.39 typical visit price
range $62.96 – $187.60
Typical copayment $35.59 (range $15.74 – $46.90)
Most-billed visit code 99204
Established Patient
$77.96 typical visit price
range $20.84 – $153.61
Typical copayment $19.49 (range $5.21 – $38.40)
Most-billed visit code 99213
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 7

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

SHIH-FAN SUN
Internal Medicine
501 DEEP VALLEY DR STE 100
ROLLING HILLS ESTATES, CA 90274
Los Angeles County (310) 303-3953
JOHN PETER LIVONI MD
Radiology (Diagnostic Radiology)
501 DEEP VALLEY DR STE 100
ROLLING HILLS ESTATES, CA 90274
Los Angeles County (310) 301-6800
HANBYUL CHOI
Internal Medicine
501 DEEP VALLEY DR STE 100
ROLLING HILLS ESTATES, CA 90274
Los Angeles County (310) 303-3953
DR. SUZANNE Y HOMER M.D.
Radiology (Diagnostic Radiology)
501 DEEP VALLEY DR STE 100
ROLLING HILLS ESTATES, CA 90274
Los Angeles County (310) 303-3953
PREETI JHORAR M.D.
Dermatology
501 DEEP VALLEY DR STE 100
ROLLING HILLS ESTATES, CA 90274
Los Angeles County (310) 303-3953
ROBERT A. REISS MD
Internal Medicine
501 DEEP VALLEY DR STE 100
ROLLING HILLS ESTATES, CA 90274
Los Angeles County (310) 670-1120
KIMNGAN PHAM NGUYEN
Family Medicine
501 DEEP VALLEY DR STE 100
ROLLING HILLS ESTATES, CA 90274
Los Angeles County (310) 303-3953

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Daniel O'brien's NPI number?

The NPI number for Daniel O'brien is 1023512431. It was assigned to this individual provider in the NPPES registry on March 20, 2018.

Where is Daniel O'brien located?

Daniel O'brien practices at 501 Deep Valley Dr Ste 100, Rolling Hills Estates, CA 90274. The listed phone number is (310) 303-3953.

What is Daniel O'brien's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Cardiovascular Disease, with taxonomy code 207RC0000X.

Is Daniel O'brien enrolled in Medicare?

Yes. Daniel O'brien is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

When was this NPI record last updated?

The NPPES record for Daniel O'brien was last updated on March 25, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.