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CATHERINE M. MATTHYS M.D.
NPI 1104244656
Internal Medicine in Mission Hills, CA

Active since April 02, 2014PECOS EnrolledAccepts Medicare Assignment
11333 SEPULVEDA BLVD, MISSION HILLS, CA 91345(818) 365-9531 Get Directions Write a Review

NPPES record last updated: September 6, 2017. Verified against the NPPES registry weekly; last sync: October 25, 2026.

About Catherine M. Matthys M.d. NPPES

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

CATHERINE M. MATTHYS M.D. (NPI 1104244656) is an individual internal medicine provider in Mission Hills, California, licensed in California (A139337) and active in the NPI registry since April 2014. She is enrolled in Medicare PECOS, is affiliated with Beth Israel Deaconess Hospital Plymouth, and is a graduate of Other (2014).

NPPES Registry Identity

NPI1104244656
Entity TypeIndividualFemale
Primary Taxonomy207R00000X
Provider Legal NameCATHERINE M. MATTHYSCredential: M.D.
Location Address11333 SEPULVEDA BLVDMission Hills, CA 91345-1116
Mailing AddressPo Box 9602Mission Hills, CA 91346-9602 · (818) 837-5559 · Fax (818) 792-4793
Phone(818) 365-9531
Sole ProprietorNo
Medical School CMSOtherGraduated 2014
Enumeration DateApril 2, 2014
Last NPPES UpdateSeptember 6, 2017
✔ NPI 1104244656 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
License✔ Licensed in CA · A139337
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.
Also ListedStudent in an Organized Health Care Education/Training ProgramTaxonomy 390200000X
11333 SEPULVEDA BLVD, Mission Hills, CA 91345
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Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Taro Health.Insurance ›

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

Catherine M. Matthys 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 ID3779855499
PECOS Enrollment IDI20190620000296
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 Catherine Matthys reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Associated Physicians Of Harvard Medical Faculty Physicians At Beth Is
2,599 mi
Emergency Medical Services
330 BROOKLINE AVE
Boston, MA 02215
  • Reassigned Medicare billing, Massachusetts enrollment
  • Also billed through NPI 1497151773 (Massachusetts)
  • 1,006 clinicians in this Medicare group
NPI 1952358533 (617) 754-2320
Beth Israel Deaconess Medical Center, Inc.
2,599 mi
General Acute Care Hospital
330 BROOKLINE AVE, ST 207
Boston, MA 02215
  • Reassigned Medicare billing, Massachusetts enrollment
  • 1,477 clinicians in this Medicare group
NPI 1548202641 (617) 667-1961
Harvard Medical Faculty Phys At Beth Israel Deaconess Med Ctr Inc
2,599 mi
Internal Medicine
330 BROOKLINE AVE
Boston, MA 02215
  • Reassigned Medicare billing, Massachusetts enrollment
  • 2,579 clinicians in this Medicare group
NPI 1194765438 (617) 754-9600

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.

Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 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.
237 services90 patients
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes 99233
Follow-up hospital inpatient care per day typically involves a 35-minute check-up by your healthcare provider. This service includes monitoring your health progress, adjusting your treatment plan if needed, and answering any questions you may have about your condition or care.
138 services65 patients
Initial hospital care with moderate level of medical decision making, if using time, at least 75 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.
122 services121 patients
Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes 99222
Initial hospital inpatient care is a service where a healthcare provider spends about 50 minutes per day overseeing your care while you're admitted in the hospital. This includes reviewing your health status, planning your treatment, and ensuring your safety and comfort.
98 services97 patients
Hospital discharge day management, more than 30 minutes 99239
Hospital discharge day management over 30 minutes involves a detailed process to ensure a smooth transition from hospital to home. It includes final examinations, discussion of your hospital stay, post-discharge instructions, and coordinating follow-up care.
58 services58 patients

Hospital Affiliations CMS Care Compare 4

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Beth Israel Deaconess Hospital Plymouth

Acute Care Hospitals · Plymouth, MA
4/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number220060
Location275 Sandwich StreetPlymouth, MA 02360 · Plymouth County
Emergency services Birthing friendly

Beth Israel Deaconess Hospital - Needham

Acute Care Hospitals · Needham, MA
4/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number220083
Location148 Chestnut StreetNeedham, MA 02494 · Norfolk County
Emergency services

Beth Israel Deaconess Medical Center

Acute Care Hospitals · Boston, MA
4/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number220086
Location330 Brookline AvenueBoston, MA 02215 · Suffolk County
Emergency services Birthing friendly

Beth Israel Deaconess Hospital - Milton

Acute Care Hospitals · Milton, MA
4/5 CMS rating
OwnershipGovernment - Federal
CMS Certification Number220108
Location199 Reedsdale RoadMilton, MA 02186 · Norfolk County
Emergency services

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 91345 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.

SARTHI RAKSHEN SHAH M.D.
Internal Medicine
11333 SEPULVEDA BLVD
MISSION HILLS, CA 91345
Los Angeles County (818) 365-9531
ARMIN TAHOORI M.D.
Hospitalist
11333 SEPULVEDA BLVD
MISSION HILLS, CA 91345
Los Angeles County (818) 365-9531
DR. HENIE FIALKOFF M.D.
Pediatrics
11333 SEPULVEDA BLVD
MISSION HILLS, CA 91345
Los Angeles County (818) 869-7200
JENNIFER ANN SHIELDS RPT.
Physical Therapist
11333 SEPULVEDA BLVD
MISSION HILLS, CA 91345
Los Angeles County (818) 365-9531
SIMON DARDASHTI M.D.
Anesthesiology
11333 SEPULVEDA BLVD
MISSION HILLS, CA 91345
Los Angeles County (818) 869-7726
ROHIT R KEDIA D.O.
Internal Medicine (Endocrinology, Diabetes & Metabolism)
11333 SEPULVEDA BLVD
MISSION HILLS, CA 91345
Los Angeles County (818) 365-9531
TRICIA A SCHREINER-DUNCAN P.A.
Physician Assistant
11333 SEPULVEDA BLVD
MISSION HILLS, CA 91345
Los Angeles County (818) 365-9531
SOURABH SURYADEVARA M.D.
Internal Medicine
11333 SEPULVEDA BLVD
MISSION HILLS, CA 91345
Los Angeles County (818) 365-9531

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 Catherine Matthys's NPI number?

The NPI number for Catherine Matthys is 1104244656. It was assigned to this individual provider in the NPPES registry on April 2, 2014.

Where is Catherine Matthys located?

Catherine Matthys practices at 11333 Sepulveda Blvd, Mission Hills, CA 91345. The listed phone number is (818) 365-9531.

What is Catherine Matthys's specialty?

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

Is Catherine Matthys enrolled in Medicare?

Yes. Catherine Matthys 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 Catherine Matthys's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Catherine Matthys reassigns Medicare benefits to 3 organizations: Associated Physicians Of Harvard Medical Faculty Physicians At Beth Is (Boston, MA), Beth Israel Deaconess Medical Center, Inc. (Boston, MA) and Harvard Medical Faculty Phys At Beth Israel Deaconess Med Ctr Inc (Boston, MA). 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 Catherine Matthys's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Catherine Matthys accept?

Health plans from Taro Health list Catherine Matthys as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

Is Catherine Matthys affiliated with any hospitals?

According to CMS data, Catherine Matthys is affiliated with Beth Israel Deaconess Hospital Plymouth, Beth Israel Deaconess Hospital - Needham, Beth Israel Deaconess Medical Center and Beth Israel Deaconess Hospital - Milton.

When was this NPI record last updated?

The NPPES record for Catherine Matthys was last updated on September 6, 2017. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 9 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.