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HMAYAK HAMO MATOSSIAN M.D.
NPI 1801810536
Anesthesiology in Arcadia, CA

Active since July 26, 2006PECOS EnrolledAccepts Medicare Assignment
300 W HUNTINGTON DR, ARCADIA, CA 91007(626) 445-4441(626) 821-6955 Get Directions Write a Review

NPPES record last updated: July 8, 2007. Verified against the NPPES registry weekly; last sync: November 08, 2026.

About Hmayak Hamo Matossian M.d. NPPES

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

HMAYAK HAMO MATOSSIAN M.D. (NPI 1801810536) is an individual anesthesiology provider in Arcadia, California, licensed in California (A64000) and active in the NPI registry since July 2006. He is enrolled in Medicare PECOS and is a graduate of Loma Linda University School Of Medicine (1995).

NPPES Registry Identity

NPI1801810536
Entity TypeIndividualMale
Primary Taxonomy207L00000X
Provider Legal NameHMAYAK HAMO MATOSSIANCredential: M.D.
Location Address300 W HUNTINGTON DRArcadia, CA 91007-3402
Mailing Address225 S Lake Ave, 535Pasadena, CA 91101-3005 · (626) 795-6596 · Fax (626) 795-8247
Phone(626) 445-4441
Fax(626) 821-6955
Sole ProprietorYes
Medical School CMSLoma Linda University School Of MedicineGraduated 1995
Enumeration DateJuly 26, 2006
Last NPPES UpdateJuly 8, 2007
✔ NPI 1801810536 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyAnesthesiologyAllopathic & Osteopathic Physicians
Taxonomy Code207L00000X
License✔ Licensed in CA · A64000
Definition
An anesthesiologist is trained to provide pain relief and maintenance, or restoration, of a stable condition during and immediately following an operation or an obstetric or diagnostic procedure. The anesthesiologist assesses the risk of the patient undergoing surgery and optimizes the patient's condition prior to, during and after surgery. In addition to these management responsibilities, the anesthesiologist provides medical management and consultation in pain management and critical care medicine. Anesthesiologists diagnose and treat acute, long-standing and cancer pain problems; diagnose and treat patients with critical illnesses or severe injuries; direct resuscitation in the care of patients with cardiac or respiratory emergencies, including the need for artificial ventilation; and supervise post-anesthesia recovery.
300 W HUNTINGTON DR, Arcadia, CA 91007
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Other Identifiers 4

Other00A640000CA · Blue Shield
Medicaid00A640001CA
Medicare UPINH10077
Medicare ID-Type UnspecifiedA64000CA

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

Hmayak Hamo Matossian M.d. 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 ID1557303534
PECOS Enrollment IDI20050531001066
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

3

Medicare enrollment records show Hmayak Matossian reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Pacific Valley Medical Group
6.1 mi
Anesthesiology
100 W CALIFORNIA BLVD
Pasadena, CA 91105
  • Reassigned Medicare billing, California enrollment
  • 214 clinicians in this Medicare group
NPI 1851312862 (626) 397-5000
Usc Care Medical Group, Inc
10 mi
General Practice
1520 SAN PABLO ST
Los Angeles, CA 90033
  • Reassigned Medicare billing, California enrollment
  • 2,445 clinicians in this Medicare group
NPI 1902846306 (323) 442-5955
Tip Top Anesthesia Group Inc
20 mi
Licensed Practical Nurse
50 N LA CIENEGA BLVD, SUITE 203
Beverly Hills, CA 90211
  • Reassigned Medicare billing, California enrollment
  • 88 clinicians in this Medicare group
NPI 1508283698 (323) 988-0896

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 5

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.

Anesthesia for lens surgery 00142
Anesthesia for lens surgery involves administering medication to numb the eye area, ensuring you feel no pain during the procedure. This can be a local anesthetic (numbing only the eye area) or general (where you're asleep). It helps make the surgery comfortable and stress-free.
110 services107 patients
Anesthesia for other procedure on esophagus, stomach, or upper small bowel using an endoscope 00731
This procedure involves the use of an endoscope, a flexible tube with a light and camera, to examine your esophagus, stomach, or upper small bowel. Anesthesia ensures you are comfortable and pain-free during the procedure.
27 services27 patients
Anesthesia for other procedure on eye 00140
Anesthesia for an eye procedure involves administering medication to numb your eye and surrounding area, ensuring you feel no pain during the operation. It can be local (only the eye area) or general (whole body). It's safe and helps make the procedure comfortable.
20 services19 patients
Anesthesia for procedure on small and large bowel using an endoscope 00813
Anesthesia for an endoscopic procedure on the small and large bowel ensures comfort and relaxation during the procedure. It involves administering medicine to help you sleep or feel drowsy. This allows the doctor to examine your bowels without causing you discomfort or pain.
12 services12 patients
Anesthesia for total hip replacement 01214
Anesthesia for total hip replacement is a medical service where medication is given to eliminate pain during surgery. Two types are commonly used: general anesthesia, making you unconscious, or spinal anesthesia, numbing the lower body. The choice depends on your health and your doctor's recommendation.
11 services11 patients

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.

DR. JUAN CARLOS ECHEVERRIA M.D.
Radiology (Vascular & Interventional Radiology)
300 W HUNTINGTON DR
ARCADIA, CA 91007
Los Angeles County (626) 898-8004
DANIEL PIENING MD
Emergency Medicine
300 W HUNTINGTON DR
ARCADIA, CA 91007
Los Angeles County (626) 898-8000
MELODY MELOSERDOFF RD
Dietitian, Registered
300 W HUNTINGTON DR
ARCADIA, CA 91007
Los Angeles County (626) 898-8000
NATALIE Z MILLS M.D.
Pathology (Cytopathology)
300 W HUNTINGTON DR
ARCADIA, CA 91007
Los Angeles County (626) 445-4441
DR. RAHTNA BANERJEE M.D.
Anesthesiology
300 W HUNTINGTON DR
ARCADIA, CA 91007
Los Angeles County (626) 898-8000
ERIC GABRIEL BARRETTO RN
Registered Nurse
300 W HUNTINGTON DR
ARCADIA, CA 91007
Los Angeles County (626) 574-3701
DR. ALAN C SCHLAERTH M.D.
Obstetrics & Gynecology (Gynecologic Oncology)
300 W HUNTINGTON DR, PACIFIC GYNECOLOGIC SPECIALISTS
ARCADIA, CA 91007
Los Angeles County (626) 898-8198
RAVINDRAKUMAR G GURUSWAMY M. D., MPH
Hospitalist
300 W HUNTINGTON DR
ARCADIA, CA 91007
Los Angeles County (626) 795-2244

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 Hmayak Matossian's NPI number?

The NPI number for Hmayak Matossian is 1801810536. It was assigned to this individual provider in the NPPES registry on July 26, 2006.

Where is Hmayak Matossian located?

Hmayak Matossian practices at 300 W Huntington Dr, Arcadia, CA 91007. The listed phone number is (626) 445-4441.

What is Hmayak Matossian's specialty?

The primary specialty registered for this NPI is Anesthesiology with taxonomy code 207L00000X.

Is Hmayak Matossian enrolled in Medicare?

Yes. Hmayak Matossian is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

Which organizations bill Medicare for Hmayak Matossian's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Hmayak Matossian reassigns Medicare benefits to 3 organizations: Pacific Valley Medical Group (Pasadena, CA), Usc Care Medical Group, Inc (Los Angeles, CA) and Tip Top Anesthesia Group Inc (Beverly Hills, CA). Each 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 Hmayak Matossian'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 Hmayak Matossian was last updated on July 8, 2007. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 19 years 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.