Ronald Mathiasen, MD
Otolaryngology Physician · San Diego, CA
Ronald Mathiasen, MD is an otolaryngology physician with a practice address in San Diego, California, and NPI 1790740629, issued on Apr 20, 2006. Check the license (California A064829, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Ronald Mathiasen
- Credential
- MD
- Primary taxonomy
- Otolaryngology Physician 207Y00000X
- License number
- A064829 CA
Self-reported in NPPES; status is on the state search - Practice location
- 10670 Wexford St, San Diego, CA 92131
- Phone
- (858) 621-4090
- Enumerated
- Apr 20, 2006
- Record last updated
- Jun 25, 2013 (not updated in 13 years: call before relying on the address or phone)
- Fax
- (858) 621-4044
- Medicaid ID
- 00A648290 CA
- Medicare enrollment
- Enrolled (PECOS I20060309000331); accepts Medicare assignment
- Medical or professional school
- University Of California, San Diego School Of Medicine, 1996
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest otolaryngology physician records → All 1,212 in California → Look up another NPI →
Also registered at 10670 Wexford St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Thomas Adamson, M.D.Rheumatology Physician1639187057
- Emelya Ahadian, M.D.Internal Medicine Physician1477561777
- Kevin Antonio, M.D.Geriatric Medicine (Internal Medicine) Physician1770760951
- Angelica Bayardo, MDFamily Medicine Physician1023157724
- Gayatri Chhatre, M.D.Obstetrics & Gynecology Physician1972739746
- Joyce Chung, M.D.Endocrinology, Diabetes & Metabolism Physician1477561504
Verify Ronald Mathiasen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A064829Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
66% fewer Medicare Part D claims than the average otolaryngology physician in 2024
185 Medicare Part D claims for 82 beneficiaries, against an average of 541 among the 8,339 providers of this specialty who prescribed in Part D. 35 claims were for opioids.
Most prescribed
- Azelastine Hcl33 claims
- Ipratropium Bromide29 claims
- Hydrocodone-Acetaminophen28 claims
- Cephalexin25 claims
- Prednisone11 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.
The practice group's MIPS final score for 2023 (Medicare payment program): 73.6 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $168.38
3 payments; by number, the most common kind was food and beverage; the largest payer was Medtronic, Inc. The 6,429 providers of this specialty with any payment received $1,922.50 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Sharp Rees-Stealy Medical Group IncSan Diego, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Ronald Mathiasen among 1,212 otolaryngology physician records in California
Ronald Mathiasen, MD 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 2006, is newer than 7% of them.
- NPI issued2006 · 7% of these records are older, 52% newer
- In a Medicare fileYes · 80% of these records are
- In the CMS Doctors and Clinicians fileYes · 67% of these records are
- Graduated1996 · median 2004 among the 818 with a school on file
- Record last updated2013 · 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 San Diego → Otolaryngology Physician nationwide →
The 8 otolaryngology physician records with the nearest ZIP codes
- Michael Holtel, M.D.San Diego, CA 921311073584397
- Andrew Beros, M.D.San Diego, CA 921301104889054
- Art Ambrosio, MD, MBASan Diego, CA 921341205064805
- Samuel Frasier, MDSan Diego, CA 921341245506716
- Philip Gaudreau, M.D.San Diego, CA 921341326207077
- Austin Labanc, DOSan Diego, CA 921341932639432
- David Mullin, M.D.San Diego, CA 921341093789687
- Joseph Traxler, M.D.San Diego, CA 921281972931236
Common questions
What is Ronald Mathiasen, MD's NPI number?
Ronald Mathiasen, MD's National Provider Identifier (NPI) is 1790740629, issued on Apr 20, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Ronald Mathiasen, MD located?
The NPPES record lists a practice address at 10670 Wexford St, San Diego, CA, 92131. Phone: (858) 621-4090. Providers update this record themselves, so call before visiting.
How can I verify Ronald Mathiasen, MD's license?
NPPES lists California license number A064829, 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 Ronald Mathiasen, MD prescribe under Medicare Part D?
In 2024, Ronald Mathiasen, MD had 185 Medicare Part D claims for 82 beneficiaries; the average among otolaryngology physician prescribers was 541. Part D covers Medicare prescriptions only.
What is Ronald Mathiasen, MD's MIPS final score?
The 2023 MIPS final score is 73.6 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
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.