ILARIA OLIVER MASTROSERIO PA-C
NPI 1376197590
Physician Assistant in Walnut Creek, CA

Active since July 25, 2019PECOS EnrolledAccepts Medicare Assignment
31.16/100
CMS Quality Rating
177 LA CASA VIA STE 390, WALNUT CREEK, CA 94598(925) 692-5610 Get Directions Write a Review

NPPES record last updated: May 22, 2024. Verified against the NPPES registry weekly; last sync: July 19, 2026.

Record update history: Jan 3, 2024, Jan 12, 2023, Aug 6, 2019 and 1 more (4 updates tracked since 2019).

About Ilaria Oliver Mastroserio Pa-c NPPES

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

ILARIA OLIVER MASTROSERIO PA-C (NPI 1376197590) is an individual physician assistant in Walnut Creek, California and active in the NPI registry since July 2019. She is enrolled in Medicare PECOS and is a graduate of Other (2019).

NPPES Registry Identity

NPI1376197590
Entity TypeIndividualFemale
Primary Taxonomy363A00000X
Provider Legal NameILARIA OLIVER MASTROSERIOCredential: PA-C
Location Address177 LA CASA VIA STE 390Walnut Creek, CA 94598-6101
Mailing Address1450 Treat Blvd Ste 300Walnut Creek, CA 94597-2168 · (925) 952-2828
Sole ProprietorNo
Medical School CMSOtherGraduated 2019
Enumeration DateJuly 25, 2019
Last NPPES UpdateMay 22, 20244 updates tracked since enumeration
NPPES CertifiedMay 22, 2024
NPI 1376197590 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

Primary SpecialtyPhysician AssistantPhysician Assistants & Advanced Practice Nursing Providers
Taxonomy Code363A00000X
Definition

A physician assistant is a person who has successfully completed an accredited education program for physician assistant, is licensed by the state and is practicing within the scope of that license. Physician assistants are formally trained to perform many of the routine, time-consuming tasks a physician can do. In some states, they may prescribe medications. They take medical histories, perform physical exams, order lab tests and x-rays, and give inoculations. Most states require that they work under the supervision of a physician.

177 LA CASA VIA STE 390, Walnut Creek, CA 94598

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

Ilaria Oliver Mastroserio Pa-c 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 ID840521779
PECOS Enrollment IDI20231023003598
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 6

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 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.
195 services131 patients
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.
50 services41 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.
50 services22 patients
Subsequent hospital care with straightforward or low level of medical decision making, per day, if using time, at least 25 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.
38 services21 patients
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.
28 services15 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.
20 services19 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 94598 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
$104.51 typical visit price
range $69.00 – $202.35
Typical copayment $26.12 (range $17.25 – $50.58)
Most-billed visit code 99203
Established Patient
$84.91 typical visit price
range $23.44 – $166.46
Typical copayment $21.22 (range $5.86 – $41.61)
Most-billed visit code 99213
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Medicare Quality Performance CMS QPP · MIPS

Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.

31.16/100
MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program
Scored as part of a group practice
Quality18.99
Promoting Interoperability0
Improvement Activities20
Cost59.89

Referred Medical Equipment & Supplies CMS DME claims 2

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

Lightweight wheelchair K0003
DME-Wheelchairs · category DD000N
1 supplier12 claims12 services$30.06 avg. paid by Medicare
Elevating leg rests, pair (for use with capped rental wheelchair base) K0195
DME-Wheelchairs · category DD021N
1 supplier12 claims12 services$8.37 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 15

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

Physician Assistant
177 LA CASA VIA STE 390
WALNUT CREEK, CA 94598
Nurse Practitioner
177 LA CASA VIA STE 390
WALNUT CREEK, CA 94598
Internal Medicine (Hematology & Oncology)
177 LA CASA VIA STE 390
WALNUT CREEK, CA 94598
Internal Medicine (Hematology & Oncology)
177 LA CASA VIA STE 390
WALNUT CREEK, CA 94598
Nurse Practitioner
177 LA CASA VIA STE 390
WALNUT CREEK, CA 94598
Nurse Practitioner
177 LA CASA VIA STE 390
WALNUT CREEK, CA 94598
Nurse Practitioner
177 LA CASA VIA STE 390
WALNUT CREEK, CA 94598
Nurse Practitioner (Family)
177 LA CASA VIA STE 390
WALNUT CREEK, CA 94598

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 Ilaria Mastroserio's NPI number?

The NPI number for Ilaria Mastroserio is 1376197590. It was assigned to this individual provider in the NPPES registry on July 25, 2019.

Where is Ilaria Mastroserio located?

Ilaria Mastroserio practices at 177 La Casa Via Ste 390, Walnut Creek, CA 94598. The listed phone number is (925) 692-5610.

What is Ilaria Mastroserio's specialty?

The primary specialty registered for this NPI is Physician Assistant with taxonomy code 363A00000X.

Is Ilaria Mastroserio enrolled in Medicare?

Yes. Ilaria Mastroserio 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.

When was this NPI record last updated?

The NPPES record for Ilaria Mastroserio was last updated on May 22, 2024. NPI Profile syncs with the weekly NPPES data releases published by CMS.