Joseph J. Mattern, M.D.
Family Medicine Physician · Port Townsend, WA
Joseph J. Mattern, M.D. is a family medicine physician with a practice address in Port Townsend, Washington, and NPI 1023060423, issued on May 16, 2006. Check the license (Washington MD00042614, as entered in NPPES) on the Washington Medical Commission; the Medicare figures below come from public CMS files.
- Name
- Joseph J. Mattern
- Credential
- M.D.
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- MD00042614 WA
Self-reported in NPPES; status is on the state search - Practice location
- 915 Sheridan St, Port Townsend, WA 98368
- Phone
- (360) 379-8031
- Enumerated
- May 16, 2006
- Record last updated
- Sep 2, 2011 (not updated in 15 years: call before relying on the address or phone)
- Fax
- (360) 385-0418
- Medicaid ID
- 7118748 WA
- Medicare enrollment
- Enrolled (PECOS I20050830000445); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 5,534 in Washington → Look up another NPI →
Also registered at 915 Sheridan St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Sarah Abhold, DOFamily Medicine Physician1962991992
- Charlene AdelsPhysician Assistant1700068764
- Jane Albee, A.R.N.P.Women's Health Nurse Practitioner1104857838
- Katherine Biccum, D.O.Family Medicine Physician1407236912
- Rachel Bickling, MDFamily Medicine Physician1760587133
- Robert Butterfield, M.D.Internal Medicine Physician1831142132
Verify Joseph J. Mattern in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWashington Medical Commission
Search for license MD00042614Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
9% fewer Medicare Part D claims than the average family medicine physician in 2024
3,212 Medicare Part D claims for 179 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 11% of claims. 192 claims were for opioids.
Most prescribed
- Atorvastatin Calcium182 claims
- Levothyroxine Sodium156 claims
- Metoprolol Succinate87 claims
- Omeprazole85 claims
- Losartan Potassium82 claims
- Mirtazapine79 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 MIPS final score for 2023 (Medicare payment program): 83.8 of 100
The Merit-based Incentive Payment System score is reported for this clinician. 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; category weights for 2023 (qpp.cms.gov).
Bills Medicare through one group practice
- Jefferson County Public Hospital District NO 2Port Townsend, WA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Joseph J. Mattern among 5,534 family medicine physician records in Washington
Joseph J. Mattern, M.D. 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 2006, is newer than 8% of them.
- NPI issued2006 · 8% of these records are older, 58% newer
- In a Medicare fileYes · 73% of these records are
- In the CMS Doctors and Clinicians fileYes · 60% of these records are
- Graduated2000 · median 2009 among the 3,294 with a school on file
- Record last updated2011 · 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).
14 family medicine physician records list a practice address in Port Townsend
They are 14 of the 601 NPPES records with a practice address in Port Townsend, and 5,534 family medicine physician records in Washington.
All 5,534 in Washington → Every provider in Port Townsend → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Sarah Abhold, DOPort Townsend, WA 983681962991992
- Katherine Biccum, D.O.Port Townsend, WA 983681407236912
- Rachel Bickling, MDPort Townsend, WA 983681760587133
- Todd Carlson, M.D.Port Townsend, WA 983681164475554
- Stephen Erickson, MDPort Townsend, WA 983681932259587
- David Harris, M.D.Port Townsend, WA 983681154373553
- Claus Janssen, M.D.Port Townsend, WA 983681992758312
- Shannan Kirchner, M.D.Port Townsend, WA 983681518994615
Common questions
What is Joseph J. Mattern, M.D.'s NPI number?
Joseph J. Mattern, M.D.'s National Provider Identifier (NPI) is 1023060423, issued on May 16, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Joseph J. Mattern, M.D. located?
The NPPES record lists a practice address at 915 Sheridan St, Port Townsend, WA, 98368. Phone: (360) 379-8031. Providers update this record themselves, so call before visiting.
How can I verify Joseph J. Mattern, M.D.'s license?
NPPES lists Washington license number MD00042614, 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 Joseph J. Mattern, M.D. prescribe under Medicare Part D?
In 2024, Joseph J. Mattern, M.D. had 3,212 Medicare Part D claims for 179 beneficiaries; the average among family medicine physician prescribers was 3,544. Part D covers Medicare prescriptions only.
What is Joseph J. Mattern, M.D.'s MIPS final score?
The 2023 MIPS final score is 83.8 of 100. 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.