DR. BRIAN NICHOLAS MASON DO
NPI 1942889217
Family Medicine in Santa Monica, CA

Q: What is Brian Mason's NPI number?

The NPI number for Brian Mason is 1942889217. It was assigned to this individual provider in the NPPES registry on April 5, 2021.

Q: What is Brian Mason's specialty?

The primary specialty registered for this NPI is Family Medicine with taxonomy code 207Q00000X.

Q: When was this NPI record last updated?

The NPPES record for Brian Mason was last updated on June 2, 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.

Active since April 05, 2021PECOS EnrolledAccepts Medicare Assignment

1245 16TH ST STE 125, SANTA MONICA, CA 90404(310) 315-8900(310) 315-8902 Get Directions Write a Review

NPPES record last updated: June 2, 2026. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Jun 2, 2026, Oct 4, 2024, Apr 5, 2021 (3 updates tracked since 2021).

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About Dr. Brian Nicholas Mason Do NPPES

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

DR. BRIAN NICHOLAS MASON DO (NPI 1942889217) is an individual family medicine provider in Santa Monica, California, licensed in California (20A23853) and active in the NPI registry since April 2021. He is enrolled in Medicare PECOS and is a graduate of Other (2020).

NPPES Registry Identity

NPI1942889217

Entity TypeIndividualMale

Primary Taxonomy207Q00000X

Provider Legal NameDR. BRIAN NICHOLAS MASONCredential: DO

Location Address1245 16TH ST STE 125Santa Monica, CA 90404-1240

Mailing Address5767 W Century Blvd Ste 400Los Angeles, CA 90045-5631

Phone(310) 315-8900

Fax(310) 315-8902

Sole ProprietorYes

Medical School CMSOtherGraduated 2020

Enumeration DateApril 5, 2021

Last NPPES UpdateJune 2, 20263 updates tracked since enumeration

NPPES CertifiedJune 2, 2026

✔ NPI 1942889217 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyFamily MedicineAllopathic & Osteopathic Physicians

Taxonomy Code207Q00000X

License✔ Licensed in CA · 20A23853

Definition

Family Medicine is the medical specialty which is concerned with the total health care of the individual and the family. It is the specialty in breadth which integrates the biological, clinical, and behavioral sciences. The scope of family medicine is not limited by age, sex, organ system, or disease entity.

Also ListedInternal MedicineTaxonomy 207R00000X · License 20A23853 (CA)

1245 16TH ST STE 125, Santa Monica, CA 90404

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Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Oscar Health Plan, Inc., Oscar Insurance Company.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Dr. Brian Nicholas Mason Do 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 ID8729488572

PECOS Enrollment IDI20241016002615, I20250623003784

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.

Medicare Billing Reassignments

Medicare enrollment records show Brian Mason reassigns Medicare billing to 4 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

The Regents Of The University Of California

3.9 mi

Internal Medicine

200 MEDICAL PLAZA, SUITE 365,530,420,250,120,214
Los Angeles, CA 90095

Reassigned Medicare billing, California enrollment
1,766 clinicians in this Medicare group

NPI 1235107566 (310) 794-1276

Im-Fsr Inc.

47 mi

Hospitalist

17416 E. PARK
Chino Hills, CA 91709

Reassigned Medicare billing, California enrollment
72 clinicians in this Medicare group

NPI 1154742229 (703) 622-5195

Hospitalist Group Of Montebello Inc

54 mi

Hospitalist

250 E RINCON ST STE 106
Corona, CA 92879

Reassigned Medicare billing, California enrollment
123 clinicians in this Medicare group

NPI 1578959318 (951) 339-8459

Southeastern Physician Services PC

1,937 mi

Hospitalist

990 OAK RIDGE TPKE
Oak Ridge, TN 37830

Reassigned Medicare billing, Tennessee enrollment
1,085 clinicians in this Medicare group

NPI 1083835441 (865) 481-1000

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Areas of Expertise CMS Part B claims 3

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes 99223

Initial hospital inpatient care per day, typically 70 minutes, refers to the daily medical service provided to patients admitted to the hospital. This includes a comprehensive evaluation, diagnosis, treatment plan, and monitoring of your health condition. It ensures your well-being during your hospital stay.

208 services203 patients

Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes 99232

Follow-up hospital inpatient care involves daily check-ups while you're admitted in the hospital. Typically, a healthcare provider spends about 25 minutes each day reviewing your condition, adjusting treatment if needed, and answering any questions you might have.

26 services18 patients

Hospital discharge day management, 30 minutes or less 99238

Hospital discharge day management of 30 minutes or less includes finalizing your treatment, discussing your progress, and planning after-care at home. It ensures you're ready to leave the hospital and continue recovery safely.

11 services11 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 90404 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

$96.36 typical visit price

range $62.96 – $187.60

Typical copayment $24.09 (range $15.74 – $46.90)

Most-billed visit code 99203

Established Patient

$109.96 typical visit price

range $20.84 – $153.61

Typical copayment $27.49 (range $5.21 – $38.40)

Most-billed visit code 99214

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 20

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

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