Dr. Maria Siu, DO
- Medicare services, 2021
- 34
- Part D claims, 2024
- 14
- Hospital affiliations
- 1
- Industry payments
- $3,103
- Medical groups
- 2
- Practice address
- 1115 S Sunset Ave, West Covina, CA 91790
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Queen of the Valley Hospital - Unit
Acute Care Hospital-Unit · West Covina, California
Find Dr. Siu's professional email, personal email and mobile number
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Dr. Maria Siu is an OB-GYN in West Covina, California
Dr. Siu practices at Queen of the Valley Hospital - Unit in West Covina, California.
Dr. Siu's NPI, 1144513862, was assigned on May 27, 2011. Dr. Siu graduated from WesternU College of Osteopathic Medicine of the Pacific in 2011. Dr. Siu's California license number on file is 20A13839.
- NPI
- 1144513862NPI Registry (opens in a new tab)
- NPI enumeration date
- May 27, 2011
- NPI status
- Active
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
- Medical school graduation
- 2011
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Affiliation Data
Dr. Maria Siu practices at Queen of the Valley Hospital - Unit in West Covina, California
Dr. Siu's primary practice is Queen of the Valley Hospital - Unit, at 1115 S Sunset Ave, West Covina, CA 91790.
- Queen of the Valley Hospital - Unit1115 S Sunset Ave, West Covina, CA 91790
Source: Dmand AI Affiliation Data
Dr. Maria Siu is affiliated with 2 sites of care and 2 medical groups
Dr. Siu's primary practice is Queen of the Valley Hospital - Unit in West Covina, California. The medical group on file is Ob Hospitalist Group. Dmand AI also links Dr. Siu to 1 more group practice or clinic and 1 medical group, each named with a free account.
Source: Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Maria Siu's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Siu practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Queen of the Valley Hospital - Unit | Available with a free account |
| +1 more site and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Maria Siu is one of 4,642 OB-GYNs in California
Obstetrics and gynecology is Dr. Siu's primary specialty in the NPI Registry, under taxonomy code 207V00000X. Dr. Siu is board certified in obstetrics & gynecology by the American Board of Obstetrics and Gynecology. Dmand AI has Dr. Siu's licenses on file in 4 states: California, Maryland, New York and District of Columbia.
Specialties and state licenses
- Obstetrics and gynecology, CaliforniaPrimary
- Maryland license
- New York license
- District of Columbia license
OB-GYNs near Dr. Siu
Counts of OB-GYNs with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Maria Siu billed Medicare for 34 services in 2021
CMS data shows 34 Medicare services from Dr. Siu across 2 procedure codes in 2021, all of them office visits. Medicare paid $2,837 for them. Every service was in an office.
Dr. Siu's Medicare services by type, 2020 to 2021
- 2020
- 2021
- Office and hospital visits
- 2020: 442021: 3423%
Dr. Siu compared with the California median for OB-GYNs, 2021
- Dr. Siu
- California median
- Medicare services
- 34vs 5841% below
Medians across 3,823 OB-GYNs in California with Dmand AI profiles that report each measure.
Dr. Siu's most billed Medicare procedure codes, 2021
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Siu and other OB-GYNs in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Maria Siu's patients have a median age of 35
Across all payers, Dmand AI patient panel data puts Dr. Siu's median patient age at 35, with 99% women.
Dr. Siu's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 35
Patient panel by sex, all payers
- Women99%
- Men0%
Source: Dmand AI Patient Panel Data
Dr. Maria Siu wrote 14 Medicare Part D claims in 2024
In 2024, Dr. Siu wrote 14 Medicare Part D claims for 11 patients. 86% of them were for generic drugs.
Dr. Siu's Part D claims by kind of drug, 2024
- Generic12 claims86%
- Brand-name and other2 claims14%
Source: Medicare Part D Prescribers - by Provider (CMS), 2024 data
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Dr. Maria Siu received $3,103 in industry payments from 2018 to 2023
CMS Open Payments shows 50 general payments to Dr. Siu from 24 drug and device companies from 2018 to 2023. Food and beverage make up the largest share, 98% of the total. Abbvie Inc. paid the most, $578.
General payments to Dr. Siu by program year, 2018 to 2023
General payments to Dr. Siu by kind, 2018 to 2023
- Food and beverage$3,03098%
- Education$732%
Companies that paid Dr. Siu the most, 2018 to 2023
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Maria Siu graduated from WesternU College of Osteopathic Medicine of the Pacific
Dr. Siu graduated from WesternU College of Osteopathic Medicine of the Pacific in 2011.
- Medical school
- Board certified in obstetrics & gynecology
Source: Dmand AI Professional Profile Data
Dr. Maria Siu accepts plans from 8 insurance carriers
Dr. Siu is in network with 8 carriers, including Aetna, United Healthcare and LA Care. Medicare plans come from the most carriers, 5. Check the plan with the practice before a visit.
- Aetna
- United Healthcare
- LA Care
- Blue Cross Blue Shield of Massachusetts
- HCSC
- Aspirus Health Plan
- Blue Cross and Blue Shield of Kansas City
- Elevance
Plan types Dr. Siu accepts, by number of carriers
- Medicare5
- PPO5
- HMO3
- POS3
- EPO2
- Medicaid1
Source: Dmand AI Insurance Network Data
Sources for Dr. Maria Siu's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel Data |
| Part D prescribing | Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| Insurance carriers and plan types | Dmand AI Insurance Network Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Maria Siu
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Maria Siu's NPI number?
Dr. Maria Siu's NPI number is 1144513862. It was assigned on May 27, 2011, and it is active in the NPI Registry.
What kind of doctor is Dr. Maria Siu?
Dr. Maria Siu is an OB-GYN in West Covina, California. The primary specialty in the NPI Registry is Obstetrics & Gynecology Physician (taxonomy code 207V00000X).
Where does Dr. Maria Siu practice?
Dr. Siu practices at 1115 S Sunset Ave, West Covina, CA 91790. Dr. Siu's primary practice is Queen of the Valley Hospital - Unit in West Covina, California. Dmand AI also links Dr. Siu to 1 group practice or clinic and 1 medical group.
What is Dr. Maria Siu's medical license number?
Dr. Siu's California license number on file is 20A13839, one of the licenses on file in 4 states.
Which states has Dr. Maria Siu been licensed in?
Dmand AI has state licenses on file for Dr. Siu in California (2015 to 2025), Maryland, New York (2015 to 2018) and District of Columbia (2014 to 2016).
What medical group is Dr. Maria Siu part of?
Dr. Siu is linked to Ob Hospitalist Group. Dmand AI links Dr. Siu to 1 more medical group.
Does Dr. Maria Siu accept Medicare?
Yes. CMS data shows Dr. Siu billed Medicare for 34 services in 2021.
Is Dr. Maria Siu board certified?
Yes. Dr. Siu is board certified in obstetrics & gynecology by the American Board of Obstetrics and Gynecology.
What services does Dr. Maria Siu bill to Medicare?
In 2021, Dr. Siu's most billed Medicare services were office visit, new patient (99203) and office visit, established patient (99213).
Where did Dr. Maria Siu go to medical school?
Dr. Siu graduated from WesternU College of Osteopathic Medicine of the Pacific in 2011.
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Has Dr. Maria Siu received payments from drug or device companies?
CMS Open Payments shows $3,103 in general payments to Dr. Siu from 24 companies from 2018 to 2023. The largest total came from Abbvie Inc.
How long has Dr. Maria Siu been practicing?
Dr. Siu graduated from medical school in 2011, 15 years ago.
What insurance does Dr. Maria Siu accept?
Dr. Siu is in network with 8 carriers, including Aetna, United Healthcare and LA Care. Medicare plans come from the most carriers, 5. Check the plan with the practice before a visit.
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