Sonja Maddox, MD
Family Medicine Physician · Renton, WA
Sonja Maddox, MD is a family medicine physician with a practice address in Renton, Washington, and NPI 1295732113, issued on Jul 7, 2005. Check the license (Washington MD00040495, as entered in NPPES) on the Washington Medical Commission; the Medicare figures below come from public CMS files.
- Name
- Sonja Maddox
- Credential
- MD
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- MD00040495 WA
Self-reported in NPPES; status is on the state search - Practice location
- 601 S Carr RD, Renton, WA 98055
- Phone
- (425) 227-3700
- Enumerated
- Jul 7, 2005
- Record last updated
- Jun 16, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicaid ID
- 8312449 WA
- Medicare enrollment
- Enrolled (PECOS I20050930000656); accepts Medicare assignment
- Medical or professional school
- University Of Washington School Of Medicine, 1999
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 5,534 in Washington → Look up another NPI →
Also registered at 601 S Carr RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Sonja Maddox in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWashington Medical Commission
Search for license MD00040495Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
26% fewer Medicare Part D claims than the average family medicine physician in 2024
2,610 Medicare Part D claims for 214 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 14% of claims. 11 claims were for opioids.
Most prescribed
- Atorvastatin Calcium308 claims
- Metformin Hcl Er148 claims
- Amlodipine Besylate122 claims
- Lisinopril114 claims
- Hydrochlorothiazide108 claims
- Levothyroxine Sodium78 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.
Industry payments in 2024: $19.23
1 payment: food and beverage; the largest payer was Hologic Sales and Service, LLC. The 55,478 providers of this specialty with any payment received $902.55 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
- Pacmed ClinicsSeattle, WA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Sonja Maddox among 5,534 family medicine physician records in Washington
Sonja Maddox, MD is one of 5,534 family medicine physician records with a practice address in Washington. 73% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 92% newer
- In a Medicare fileYes · 73% of these records are
- In the CMS Doctors and Clinicians fileYes · 60% of these records are
- Graduated1999 · median 2009 among the 3,294 with a school on file
- Record last updated2021 · 57% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a Washington practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
111 family medicine physician records list a practice address in Renton
They are 111 of the 3,147 NPPES records with a practice address in Renton, and 5,534 family medicine physician records in Washington.
All 5,534 in Washington → Every provider in Renton → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Dhiren Ajudia, MDRenton, WA 980551043235872
- Richard Avalon, D.O.Renton, WA 980551619930088
- Reza Berjis, MDRenton, WA 980551285607606
- Janice Carlton, MDRenton, WA 980551649201872
- Gary Kelsberg, MDRenton, WA 980551790707362
- Wuaca Luna, MDRenton, WA 980551265455612
- Aileen Monponbanua, MDRenton, WA 980551639162456
- Matthew Mulder, MDRenton, WA 980551902874407
Common questions
What is Sonja Maddox, MD's NPI number?
Sonja Maddox, MD's National Provider Identifier (NPI) is 1295732113, issued on Jul 7, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Sonja Maddox, MD located?
The NPPES record lists a practice address at 601 S Carr RD, Renton, WA, 98055. Phone: (425) 227-3700. Providers update this record themselves, so call before visiting.
How can I verify Sonja Maddox, MD's license?
NPPES lists Washington license number MD00040495, as entered by the provider. Search the Washington Medical Commission at https://wahelms.my.site.com/s/license-search. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Sonja Maddox, MD prescribe under Medicare Part D?
In 2024, Sonja Maddox, MD had 2,610 Medicare Part D claims for 214 beneficiaries; the average among family medicine physician prescribers was 3,544. 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.