Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

ALIX ESTHER MASTERS
NPI 1316641202
Internal Medicine in Santa Monica, CA

Q: What is Alix Masters's NPI number?

The NPI number for Alix Masters is 1316641202. It was assigned to this individual provider in the NPPES registry on March 27, 2023.

Q: What is Alix Masters's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

Q: When was this NPI record last updated?

The NPPES record for Alix Masters was last updated on August 24, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 20 days 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 March 27, 2023PECOS Enrolled

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

NPPES record last updated: August 24, 2026. Verified against the NPPES registry weekly; last sync: September 06, 2026.

Record update history: Aug 24, 2026, Mar 27, 2023 (2 updates tracked since 2023).

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About Alix Esther Masters NPPES

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

ALIX ESTHER MASTERS (NPI 1316641202) is an individual internal medicine provider in Santa Monica, California, licensed in California (A208082) and active in the NPI registry since March 2023. She is enrolled in Medicare PECOS and is a graduate of Other (2023).

NPPES Registry Identity

NPI1316641202

Entity TypeIndividualFemale

Primary Taxonomy207R00000X

Provider Legal NameALIX ESTHER MASTERS

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

Mailing Address5767 W Century Blvd Ste 400Los Angeles, CA 90045-5631 · (310) 301-8707

Phone(310) 315-8900

Sole ProprietorNo

Medical School CMSOtherGraduated 2023

Enumeration DateMarch 27, 2023

Last NPPES UpdateAugust 24, 20262 updates tracked since enumeration

NPPES CertifiedAugust 24, 2026

✔ NPI 1316641202 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians

Taxonomy Code207R00000X

License✔ Licensed in CA · A208082

Definition

A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.

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

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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 (PECOS)

Alix Esther Masters is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

PECOS PAC ID2668937822

PECOS Enrollment IDI20260720000447

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 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

$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

$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.

MILENA M KAUFMAN D.O.

Psychiatry & Neurology (Child & Adolescent Psychiatry)