DR. MATTHEW NIENABER D.O.
NPI 1033535182
Internal Medicine in Santa Monica, CA

Q: What is Matthew Nienaber's NPI number?

The NPI number for Matthew Nienaber is 1033535182. It was assigned to this individual provider in the NPPES registry on March 13, 2014.

Q: What is Matthew Nienaber'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 Matthew Nienaber was last updated on May 28, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 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 March 13, 2014PECOS EnrolledAccepts Medicare Assignment

1821 WILSHIRE BLVD STE 100, SANTA MONICA, CA 90403(310) 575-3100(310) 575-3102 Get Directions Write a Review

NPPES record last updated: May 28, 2026. Verified against the NPPES registry weekly; last sync: November 01, 2026.

Record update history: May 28, 2026, Apr 19, 2021, Aug 21, 2020 and 2 more (5 updates tracked since 2018).

On this page

About Dr. Matthew Nienaber D.o. NPPES

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

DR. MATTHEW NIENABER D.O. (NPI 1033535182) is an individual internal medicine provider in Santa Monica, California, licensed in California (20A14759) and active in the NPI registry since March 2014. He is enrolled in Medicare PECOS, maintains a secondary practice location in Salinas, and is a graduate of Other (2014).

NPPES Registry Identity

NPI1033535182

Entity TypeIndividualMale

Primary Taxonomy207R00000X

Provider Legal NameDR. MATTHEW NIENABERCredential: D.O.

Location Address1821 WILSHIRE BLVD STE 100Santa Monica, CA 90403-5627

Mailing Address1821 Wilshire Blvd Ste 100Santa Monica, CA 90403-5627 · (310) 575-3100

Phone(310) 575-3100

Fax(310) 575-3102

Sole ProprietorNo

Medical School CMSOtherGraduated 2014

Enumeration DateMarch 13, 2014

Last NPPES UpdateMay 28, 20265 updates tracked since enumeration

NPPES CertifiedMay 28, 2026

✔ NPI 1033535182 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 · 20A14759

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.

1821 WILSHIRE BLVD STE 100, Santa Monica, CA 90403

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Secondary Practice Location 1

Location 1355 Abbott St Ste 100Salinas, CA 93901-4484 · Phone (831) 751-7070 · Fax (831) 751-7050

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. Matthew Nienaber D.o. 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 ID8224301346

PECOS Enrollment IDI20170911003106

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 Matthew Nienaber reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Nationwide Vitals, Medical Corporation

11 mi

Internal Medicine

11669 SANTA MONICA BLVD STE 110
Los Angeles, CA 90025

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

NPI 1659255958 (310) 237-8760

Providence Saint Johns Medical Foundation

12 mi

Specialist

2121 SANTA MONICA BLVD
Santa Monica, CA 90404

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

NPI 1770093734 (310) 582-7312

Svmhs Clinics

262 mi

Multi-Specialty

505 E ROMIE LN STE A
Salinas, CA 93901

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

NPI 1093158347 (831) 755-1701

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 9

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.

Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more 99214

This is a routine check-up for patients who have previously visited our clinic. It involves a comprehensive review of your health and any ongoing treatments. The consultation lasts between 30-39 minutes, allowing enough time to discuss any concerns.

163 services101 patients

Insertion of needle into vein for collection of blood sample 36415

This procedure involves inserting a small needle into a vein, typically in your arm, to collect a blood sample. It's a quick and simple process to help diagnose or monitor health conditions. You may feel a small prick, but discomfort is minimal.

121 services82 patients

Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more 99215

This service involves a follow-up appointment for existing patients, lasting between 40 to 54 minutes. During this time, your healthcare provider will assess your current health status, discuss any changes or concerns, review your treatment plan, and answer any questions you may have.

63 services41 patients

Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit G0439

An annual wellness visit is a yearly appointment with your primary care provider to create or update a personalized prevention plan. This plan helps prevent illness based on your current health and risk factors. It's a subsequent visit, meaning it follows an initial assessment.

40 services40 patients

Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more 99213

This is a routine visit for patients who have already been seen by the healthcare provider. During this approximately 20-29 minute appointment, your health status will be evaluated and any necessary treatments or tests will be discussed. It's a chance to address any health concerns you may have.

24 services22 patients

Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report 93000

An electrocardiogram (ECG) is a non-invasive test that records your heart's electrical activity. Using 12 leads attached to your body, it captures data to help identify heart conditions. A doctor interprets the results and provides a report.

17 services15 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 90403 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.

Referred Medical Equipment & Supplies CMS DME claims

Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.

Supply allowance for therapeutic continuous glucose monitor (cgm), includes all supplies and accessories, 1 month supply = 1 unit of service K0553

DME-Other DME · category DE017N

1 supplier12 claims12 services$200.12 avg. paid by Medicare

Dollar amounts are the average Medicare paid the supplier per service. They are not the cost to the patient.

Other Providers at the Same Location NPPES 8

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

MARYAM FARAZHA MD

Family Medicine