Christopher Apostol Mascarinas, M.D.
Otolaryngology Physician · Walnut Creek, CA
Christopher Apostol Mascarinas, M.D. is an otolaryngology physician with a practice address in Walnut Creek, California, and NPI 1952596744, issued on Sep 13, 2007. Check the license (California A117137, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Christopher Apostol Mascarinas
- Credential
- M.D.
- Primary taxonomy
- Otolaryngology Physician 207Y00000X
- License number
- A117137 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1425 S Main St, Walnut Creek, CA 94596
- Phone
- (925) 295-4100
- Enumerated
- Sep 13, 2007
- Record last updated
- Dec 15, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20121018000601); accepts Medicare assignment
- Medical or professional school
- State University Of New York Downstate Medical Center, 2007
- Entity
- Type 1 · individual
8 nearest otolaryngology physician records → All 1,212 in California → Look up another NPI →
Also registered at 1425 S Main St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Eric AaserudeEmergency Medicine Physician1811491194
- Derek Abbassi, MDObstetrics & Gynecology Physician1841364155
- Peter Ackerman, MDEmergency Medicine Physician1427435023
- Aaron Mark Acosta, DOEmergency Medicine Physician1538789987
- Basil Adad, MDOtolaryngology Physician1487732574
- Derek Ailes, M.D.Emergency Medical Services (Emergency Medicine) Physician1992001804
Verify Christopher Apostol Mascarinas in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A117137Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
12% fewer Medicare Part D claims than the average otolaryngology physician in 2024
476 Medicare Part D claims for 182 beneficiaries, against an average of 541 among the 8,339 providers of this specialty who prescribed in Part D. Brand-name drugs were 6% of claims.
Most prescribed
- Fluticasone Propionate65 claims
- Ipratropium Bromide54 claims
- Azelastine Hcl49 claims
- Pantoprazole Sodium45 claims
- Doxycycline Monohydrate20 claims
- Omeprazole19 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Bills Medicare through one group practice
- Permanente Medical Group IncRichmond, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Christopher Apostol Mascarinas among 1,212 otolaryngology physician records in California
Christopher Apostol Mascarinas, M.D. is one of 1,212 otolaryngology physician records with a practice address in California. 80% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 48% of them.
- NPI issued2007 · 48% of these records are older, 42% newer
- In a Medicare fileYes · 80% of these records are
- In the CMS Doctors and Clinicians fileYes · 67% of these records are
- Graduated2007 · median 2004 among the 818 with a school on file
- Record last updated2021 · 63% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Y00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Otolaryngology Physician providers in California
There are 1,212 otolaryngology physician records in California.
All 1,212 in California → Every provider in Walnut Creek → Otolaryngology Physician nationwide →
The 8 otolaryngology physician records with the nearest ZIP codes
- Basil Adad, MDWalnut Creek, CA 945961487732574
- Gregory Chin, MDWalnut Creek, CA 945961710056924
- Nicole Daamen, MDWalnut Creek, CA 945961093893588
- Bryan Fong, MDWalnut Creek, CA 945961033297163
- Elizabeth Huang, MDWalnut Creek, CA 945961629156781
- Cornelius Jansen, MDWalnut Creek, CA 945961285712380
- Glenn Schneider, MDWalnut Creek, CA 945961033297114
- Betty Tsai Do, MDWalnut Creek, CA 945961629293030
Common questions
What is Christopher Apostol Mascarinas, M.D.'s NPI number?
Christopher Apostol Mascarinas, M.D.'s National Provider Identifier (NPI) is 1952596744, issued on Sep 13, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Christopher Apostol Mascarinas, M.D. located?
The NPPES record lists a practice address at 1425 S Main St, Walnut Creek, CA, 94596. Phone: (925) 295-4100. Providers update this record themselves, so call before visiting.
How can I verify Christopher Apostol Mascarinas, M.D.'s license?
NPPES lists California license number A117137, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Christopher Apostol Mascarinas, M.D. prescribe under Medicare Part D?
In 2024, Christopher Apostol Mascarinas, M.D. had 476 Medicare Part D claims for 182 beneficiaries; the average among otolaryngology physician prescribers was 541. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.