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AARON JAMESON MUELLER MD
NPI 1033670252
Emergency Medicine in West Hills, CA

Active since March 29, 2019PECOS Enrolled
7300 MEDICAL CENTER DR, WEST HILLS, CA 91307(818) 676-4000 Get Directions Write a Review

NPPES record last updated: July 28, 2025. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Oct 27, 2023, Jun 14, 2023, May 26, 2022 (3 updates tracked since 2022).

About Aaron Jameson Mueller Md NPPES

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

AARON JAMESON MUELLER MD (NPI 1033670252) is an individual emergency medicine provider in West Hills, California, licensed in California (A184747) and active in the NPI registry since March 2019. He is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1033670252
Entity TypeIndividualMale
Primary Taxonomy207P00000X
Provider Legal NameAARON JAMESON MUELLERCredential: MD
Location Address7300 MEDICAL CENTER DRWest Hills, CA 91307-1902
Mailing Address5767 W Century Blvd Ste 400Los Angeles, CA 90045-5631
Phone(818) 676-4000
Sole ProprietorNo
Enumeration DateMarch 29, 2019
Last NPPES UpdateJuly 28, 20253 updates tracked since enumeration
NPPES CertifiedJuly 28, 2025
✔ NPI 1033670252 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyEmergency MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207P00000X
License✔ Licensed in CA · A184747
Definition
An emergency physician focuses on the immediate decision making and action necessary to prevent death or any further disability both in the pre-hospital setting by directing emergency medical technicians and in the emergency department. The emergency physician provides immediate recognition, evaluation, care, stabilization and disposition of a generally diversified population of adult and pediatric patients in response to acute illness and injury.
7300 MEDICAL CENTER DR, West Hills, CA 91307
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Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Aaron Jameson Mueller Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

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 Reassignment

Medicare enrollment records show Aaron Mueller reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Regents Of The Univ Of Ca Emer Med
14 mi
Emergency Medicine
757 WESTWOOD PLZ, STE 1419
Los Angeles, CA 90095
  • Reassigned Medicare billing, California enrollment
  • 135 clinicians in this Medicare group
NPI 1104889138 (310) 825-2111

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 4

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.

Emergency department visit with high level of medical decision making 99285
An emergency department visit for severe conditions is when you urgently seek medical help due to serious health issues. These could be severe injuries, breathing problems, unbearable pain, or sudden severe illness. Doctors and nurses will provide immediate care to stabilize your condition.
313 services306 patients
Emergency department visit with moderate level of medical decision making 99284
An emergency department visit for a high-severity issue means you're experiencing a serious health problem that needs immediate attention. This could be a severe injury, serious illness, or life-threatening condition. Medical professionals will provide urgent care to stabilize your condition.
130 services127 patients
Critical care, first 30-74 minutes 99291
Critical care involves immediate and constant attention by a team of specially-trained health professionals. It's for patients with life-threatening conditions, requiring first 30-74 minutes of intense monitoring and treatment.
81 services78 patients
Emergency department visit with low level of medical decision making 99283
An emergency department visit for a problem of moderate severity involves immediate medical attention for issues like minor fractures, burns, or high fever. The healthcare team will assess your condition, provide necessary treatment, and may suggest further tests or admission if required.
27 services26 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 91307 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.

TAHO MEDICAL GROUP
Hospitalist
7300 MEDICAL CENTER DR
WEST HILLS, CA 91307
Los Angeles County (818) 641-9289
ROSMIR ROSETA VILLALUZ FNP
Nurse Practitioner
7300 MEDICAL CENTER DR
WEST HILLS, CA 91307
Los Angeles County (818) 676-4000
PHILIP LUU M.D.
Radiology (Diagnostic Radiology)
7300 MEDICAL CENTER DR
WEST HILLS, CA 91307
Los Angeles County (818) 676-4100
KIARASH ROWHANIAN M.D.
Emergency Medicine
7300 MEDICAL CENTER DR
WEST HILLS, CA 91307
Los Angeles County (818) 676-4000
WEST HILLS HOSPITAL
General Acute Care Hospital
7300 MEDICAL CENTER DR
WEST HILLS, CA 91307
Los Angeles County (818) 676-4000
GARY SINDELL M.D.
Emergency Medicine
7300 MEDICAL CENTER DR, EMERGENCY DEPARTMENT
WEST HILLS, CA 91307
Los Angeles County (818) 676-4000
RENUKA THAKUR
Nurse Practitioner (Family)
7300 MEDICAL CENTER DR
WEST HILLS, CA 91307
Los Angeles County (818) 676-4000
LOREN E. CAIRA M.D.
Emergency Medicine
7300 MEDICAL CENTER DR, EMERGENCY DEPARTMENT
WEST HILLS, CA 91307
Los Angeles County (818) 676-4000

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 Aaron Mueller's NPI number?

The NPI number for Aaron Mueller is 1033670252. It was assigned to this individual provider in the NPPES registry on March 29, 2019.

Where is Aaron Mueller located?

Aaron Mueller practices at 7300 Medical Center Dr, West Hills, CA 91307. The listed phone number is (818) 676-4000.

What is Aaron Mueller's specialty?

The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.

Is Aaron Mueller enrolled in Medicare?

Yes. Aaron Mueller is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for Aaron Mueller's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Aaron Mueller reassigns Medicare benefits to Regents Of The Univ Of Ca Emer Med (Los Angeles, CA). The reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Aaron Mueller's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

When was this NPI record last updated?

The NPPES record for Aaron Mueller was last updated on July 28, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 15 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.