Donald Loren Slack, M.D.
Emergency Medicine Physician · Mount Vernon, WA
Donald Loren Slack, M.D. is an emergency medicine physician with a practice address in Mount Vernon, Washington, and NPI 1700816345, issued on Jul 3, 2006. Check the license (Washington MD00032809, as entered in NPPES) on the Washington Medical Commission; the Medicare figures below come from public CMS files.
- Name
- Donald Loren Slack
- Credential
- M.D.
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License number
- MD00032809 WA
Self-reported in NPPES; status is on the state search - Practice location
- 1415 E Kincaid St, Mount Vernon, WA 98274
- Phone
- (360) 424-4111
- Enumerated
- Jul 3, 2006
- Record last updated
- Mar 2, 2017 (not updated in 9 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20040323000587); accepts Medicare assignment
- Medical or professional school
- University Of Washington School Of Medicine, 1991
- Entity
- Type 1 · individual
8 nearest emergency medicine physician records → All 1,459 in Washington → Look up another NPI →
Also registered at 1415 E Kincaid St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Ahmed Abou-ZeidStudent in an Organized Health Care Education/Training Program1770421026
- Thea Anderson, ARNPFamily Nurse Practitioner1316685100
- Precious Barnes, DOHospitalist Physician1477819159
- Asheesh Batra, DOStudent in an Organized Health Care Education/Training Program1235999830
- Erin Beck, PHARMDPharmacist1871844381
- Eric Bing, MDStudent in an Organized Health Care Education/Training Program1811647977
Verify Donald Loren Slack in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWashington Medical Commission
Search for license MD00032809Check 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 emergency medicine physician in 2024
200 Medicare Part D claims for 152 beneficiaries, against an average of 226 among the 54,106 providers of this specialty who prescribed in Part D. 43 claims were for opioids.
Most prescribed
- Cephalexin31 claims
- Oxycodone Hcl25 claims
- Ondansetron Odt21 claims
- Hydrocodone-Acetaminophen17 claims
- Prednisone15 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
- Northwest Emergency Physicians LLCMount Vernon, WA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Donald Loren Slack among 1,459 emergency medicine physician records in Washington
Donald Loren Slack, M.D. is one of 1,459 emergency medicine physician records with a practice address in Washington. 74% 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 3% of them.
- NPI issued2006 · 3% of these records are older, 55% newer
- In a Medicare fileYes · 74% of these records are
- In the CMS Doctors and Clinicians fileYes · 58% of these records are
- Graduated1991 · median 2010 among the 851 with a school on file
- Record last updated2017 · 62% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207P00000X and a Washington practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
25 emergency medicine physician records list a practice address in Mount Vernon
They are 25 of the 1,500 NPPES records with a practice address in Mount Vernon, and 1,459 emergency medicine physician records in Washington.
All 1,459 in Washington → Every provider in Mount Vernon → Emergency Medicine Physician nationwide →
The 8 emergency medicine physician records with the nearest ZIP codes
- Kevin Bowman, M.D.Mount Vernon, WA 982741245269638
- Thomas Catalina, PA CMount Vernon, WA 982741851320188
- Michael Chmel, M.D.Mount Vernon, WA 982741104855675
- James Collins, MDMount Vernon, WA 982741629005384
- Worth Everett, MDMount Vernon, WA 982741356380877
- Sandra Gailey, MDMount Vernon, WA 982741013930197
- Carlton Heine, MDMount Vernon, WA 982741851328421
- Larry Nelson, MDMount Vernon, WA 982741477510493
Common questions
What is Donald Loren Slack, M.D.'s NPI number?
Donald Loren Slack, M.D.'s National Provider Identifier (NPI) is 1700816345, issued on Jul 3, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Donald Loren Slack, M.D. located?
The NPPES record lists a practice address at 1415 E Kincaid St, Mount Vernon, WA, 98274. Phone: (360) 424-4111. Providers update this record themselves, so call before visiting.
How can I verify Donald Loren Slack, M.D.'s license?
NPPES lists Washington license number MD00032809, 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 Donald Loren Slack, M.D. prescribe under Medicare Part D?
In 2024, Donald Loren Slack, M.D. had 200 Medicare Part D claims for 152 beneficiaries; the average among emergency medicine physician prescribers was 226. 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.