OLIVER LEE MASON MD
NPI 1871606434
Internal Medicine in Cerritos, CA

Q: What is Oliver Mason's NPI number?

The NPI number for Oliver Mason is 1871606434. It was assigned to this individual provider in the NPPES registry on August 17, 2006.

Q: What is Oliver Mason'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 Oliver Mason was last updated on February 4, 2016. NPI Profile syncs with the weekly NPPES data releases published by CMS.

Active since August 17, 2006PECOS EnrolledAccepts Medicare Assignment

10802 COLLEGE PL, CERRITOS, CA 90703(562) 982-0010(562) 982-0012 Get Directions Write a Review

NPPES record last updated: February 4, 2016. Verified against the NPPES registry weekly; last sync: July 26, 2026.

On this page

About Oliver Lee Mason Md NPPES

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

OLIVER LEE MASON MD (NPI 1871606434) is an individual internal medicine provider in Cerritos, California, licensed in California (G56462) and active in the NPI registry since August 2006. He is enrolled in Medicare PECOS and is a graduate of University Of California, San Francisco School Of Medicine (1984).

NPPES Registry Identity

NPI1871606434

Entity TypeIndividualMale

Primary Taxonomy207R00000X

Provider Legal NameOLIVER LEE MASONCredential: MD

Location Address10802 COLLEGE PLCerritos, CA 90703-1505

Mailing Address10650 Reagan St, 610Los Alamitos, CA 90720-8800 · (562) 982-0010 · Fax (562) 431-1319

Phone(562) 982-0010

Fax(562) 982-0012

Sole ProprietorYes

Medical School CMSUniversity Of California, San Francisco School Of MedicineGraduated 1984

Enumeration DateAugust 17, 2006

Last NPPES UpdateFebruary 4, 2016

✔ NPI 1871606434 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 · G56462

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.

10802 COLLEGE PL, Cerritos, CA 90703

Open in Google Maps ↗

Other Identifiers 3

Medicare ID-Type UnspecifiedG56462CA

Medicare UPINA93437

MedicaidOOG564620CA

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

Oliver Lee Mason Md 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 ID3476677048

PECOS Enrollment IDI20100902001140

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.

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.

Follow-up hospital inpatient care per day, typically 25 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.

184 services112 patients

Follow-up hospital inpatient care per day, typically 15 minutes 99231

Follow-up hospital inpatient care is a daily service where a healthcare professional checks on your health progress during your hospital stay. Each session typically lasts 15 minutes, involving updates on your condition and adjustments to your treatment plan, if necessary.

152 services80 patients

Initial hospital inpatient care per day, typically 70 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.

126 services109 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 90703 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.

ROSEMARIE J. MELCHOR, MD, INC

Family Medicine