Maria Virginia Sioson-Ayala, MD
NPI 1922137173 · Family Medicine Physician · El Monte, CA
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Maria Virginia Sioson-Ayala, MD is a Family Medicine Physician provider in El Monte, CA (NPI 1922137173).
Provider details
- NPI number
- 1922137173
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- Yes
- License
- A105436 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
19 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
123 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 50 | $137 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 24 | $140 |
| Annual Depression Screening, 5 to 15 MinutesG0444 | 20 | $21 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 17 | $99 |
| Administration of Influenza Virus VaccineG0008 | 12 | $35 |
Typical Medicare-allowed amounts for these services range $21–$140 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 82 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 541 | 226 |
| Lisinopril | 282 | 102 |
| Losartan Potassium | 268 | 104 |
| Metformin Hcl | 253 | 97 |
| Amlodipine Besylate | 245 | 105 |
| Levothyroxine Sodium | 211 | 84 |
| Omeprazole |
Practice location
Mailing address
Additional practice locations (1)
- 3144 Santa Anita AveEl Monte, CA 91733-1316Phone: (626) 401-4147
Registry dates
- Enumerated
- 2007-03-05
- Last updated
- 2026-02-21
- Certified
- 2026-02-21
Frequently asked questions
- What is Maria Virginia Sioson-Ayala's NPI number?
- Maria Virginia Sioson-Ayala's National Provider Identifier (NPI) is 1922137173, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Maria Virginia Sioson-Ayala's specialty?
- Maria Virginia Sioson-Ayala is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Maria Virginia Sioson-Ayala located?
- Maria Virginia Sioson-Ayala's practice location on file with NPPES is 10418 Valley Blvd, El Monte, CA 91731-3600.
- What is Maria Virginia Sioson-Ayala's phone number?
- The practice phone number listed in the NPPES registry for Maria Virginia Sioson-Ayala is (626) 453-8466.
- Does Maria Virginia Sioson-Ayala accept Medicare?
- Maria Virginia Sioson-Ayala is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Maria Virginia Sioson-Ayala's NPI active?
- Yes — Maria Virginia Sioson-Ayala's NPI (1922137173) is active in the NPPES registry as of the last update on 2026-02-21.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.