Provider Profile
Ilaria O. Mastroserio, PA-C
Unclaimed ProfileAbout Ilaria Mastroserio
Ilaria O. Mastroserio, PA-C is a physician assistant practicing in Walnut Creek, CA. According to Medicare claims data, Ilaria cared for 249 Medicare patients across 381 services. The services billed most often include established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more, subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes, and established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more. This provider record is associated with NPI 1376197590.
Factual summary compiled by Guide.md from public records; not written by this provider.
Education & Training
Specialty
Credentials & Licensing
Medicare information
Exactly as CMS reports it (National Downloadable File, Opt-Out Affidavits, Order & Referring). Not an insurance directory; confirm coverage with the office.
Contact Information
- (925) 692-5610
- Email not available
Practice Locations
177 LA CASA VIA STE 390
Walnut Creek, CA 94598
Procedures Most Often Billed to Medicare
381 services · 249 patients · 6 distinct codes
| Procedure | Type | Code | Services | Compared with peers |
|---|---|---|---|---|
| Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more | Office visit | 99215 |
195 | More than most peers in Physician Assistant |
| Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes | Office visit | 99233 |
50 | As often as other peers in Physician Assistant |
| Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more | Office visit | 99214 |
50 | As often as other peers in Physician Assistant |
| Subsequent hospital care with straightforward or low level of medical decision making, per day, if using time, at least 25 minutes | Office visit | 99231 |
38 | As often as other peers in Physician Assistant |
| Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | Office visit | 99232 |
28 | As often as other peers in Physician Assistant |
| Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes | Office visit | 99222 |
20 | As often as other peers in Physician Assistant |
Source: CMS Medicare public data. Shows how often procedures were billed — not quality of care or patient satisfaction.
Related providers
Connections drawn from the registry and from what providers have told us. A link here is not a referral or an endorsement.
Other physician assistants at this location 2
Same specialty, same street address — most likely the same department or group.
Related specialists at this location 8
Clinically related specialties at the same address — the people this provider most likely works alongside.
Also at this address 4
Providers at the same street address. Each files their own registry entry, so a shared practice often appears under several different names.
More connections — 24 related providers in 3 groups
Other physician assistants in Walnut Creek 8
Same specialty, same city.
Trained at Other 8
Other providers in the same specialty who trained at the same institution.
Class of 2019 at Other 8
Providers who graduated from the same medical school in the same year.
Common questions
What is Ilaria O. Mastroserio's specialty?
Ilaria O. Mastroserio is a physician assistant in Walnut Creek, CA. That is the designation recorded for this NPI in the federal registry.
NPI registry
Where can I find Ilaria O. Mastroserio?
Ilaria O. Mastroserio is listed at 177 la Casa Via Ste 390, Walnut Creek, CA 94598. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
How do I contact Ilaria O. Mastroserio?
The number on file is (925) 692-5610. Contact the office directly to confirm availability and scheduling.
NPI registry
What is Ilaria O. Mastroserio's NPI number?
Ilaria O. Mastroserio's National Provider Identifier is 1376197590. It is issued by the Centers for Medicare & Medicaid Services and is unique and permanent — it does not change if they move practice.
NPI registry
What is Ilaria O. Mastroserio's education?
Ilaria O. Mastroserio attended Other, graduating in 2019. This comes from the CMS National Downloadable File.
CMS public data
How long has Ilaria O. Mastroserio been practicing?
Ilaria O. Mastroserio has 7 years experience. Calculated from a graduation year of 2019, reported in the CMS National Downloadable File.
CMS public data
What is Ilaria O. Mastroserio known for?
According to Medicare billing data, Ilaria O. Mastroserio the Medicare record under this individual NPI shows mainly office visits and diagnostic testing. Hospital-based physicians usually have their procedural work billed by the facility rather than under their own number, so this is a floor on their practice, not a description of it. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Has Ilaria O. Mastroserio confirmed this information?
Not yet. This profile is built from public federal data and has not been confirmed by Ilaria O. Mastroserio. If this is you, claiming it is free.
Guide.md
Guide.md listings do not constitute medical advice or an endorsement.