Catherine Best Slack, ARNP
Nurse Practitioner · Seattle, WA
Catherine Best Slack, ARNP is a nurse practitioner with a practice address in Seattle, Washington, and NPI 1932306909, issued on Jul 2, 2007. Check the license (Washington AP30007641, as entered in NPPES) with the Washington board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Catherine Best Slack
- Credential
- ARNP
- Primary taxonomy
- Nurse Practitioner 363L00000X
- License number
- AP30007641 WA
Self-reported in NPPES; status is on the state search - Practice location
- 325 9TH Ave, Seattle, WA 98104
- Phone
- (206) 731-8749
- Enumerated
- Jul 2, 2007
- Record last updated
- Sep 20, 2007 (not updated in 19 years: call before relying on the address or phone)
- Medicaid ID
- 9653049 WA
- Medicare enrollment
- Enrolled (PECOS I20070907000039); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest nurse practitioner records → All 2,308 in Washington → Look up another NPI →
Also registered at 325 9TH Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Catherine Best Slack in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Washington board licenses this profession
Search for license AP30007641Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
94% fewer Medicare Part D claims than the average nurse practitioner in 2024
69 Medicare Part D claims for 24 beneficiaries, against an average of 1,109 among the 54,319 providers of this specialty who prescribed in Part D. Brand-name drugs were 38% of claims.
Most prescribed
- Metoprolol Succinate15 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: $56.72
2 payments; by number, the most common kind was food and beverage; the largest payer was Boston Scientific Corporation. The 38,884 providers of this specialty with any payment received $791.64 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
- The Association OF University PhysiciansSeattle, WA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Catherine Best Slack among 2,308 nurse practitioner records in Washington
Catherine Best Slack, ARNP is one of 2,308 nurse practitioner records with a practice address in Washington. 72% 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 22% of them.
- NPI issued2007 · 22% of these records are older, 71% newer
- In a Medicare fileYes · 72% of these records are
- In the CMS Doctors and Clinicians fileYes · 56% of these records are
- Graduated2006 · median 2018 among the 1,301 with a school on file
- Record last updated2007 · 47% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363L00000X and a Washington practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
569 nurse practitioner records list a practice address in Seattle
They are 569 of the 41,956 NPPES records with a practice address in Seattle, and 2,308 nurse practitioner records in Washington.
All 2,308 in Washington → Every provider in Seattle → Nurse Practitioner nationwide →
The 8 nurse practitioner records with the nearest ZIP codes
- Cheryl Bauermeister, ARNPSeattle, WA 981041407810294
- Christina Brinch, ARNPSeattle, WA 981041154359743
- Carolyn Burkhart, ARNPSeattle, WA 981041275520744
- Paula Cox-North, ARNPSeattle, WA 981041699763573
- Susan Dippery, ARNPSeattle, WA 981041073540316
- Elizabeth Dunlap, ARNPSeattle, WA 981041417908187
- Jessica Durham, ARNPSeattle, WA 981041619919362
- Jenny Hodgins-Howarth, ARNPSeattle, WA 981041508833013
Common questions
What is Catherine Best Slack, ARNP's NPI number?
Catherine Best Slack, ARNP's National Provider Identifier (NPI) is 1932306909, issued on Jul 2, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Catherine Best Slack, ARNP located?
The NPPES record lists a practice address at 325 9TH Ave, Seattle, WA, 98104. Phone: (206) 731-8749. Providers update this record themselves, so call before visiting.
How can I verify Catherine Best Slack, ARNP's license?
NPPES lists Washington license number AP30007641, as entered by the provider. Search the Washington board that licenses this profession; the NPPES record confirms identity only.
How much does Catherine Best Slack, ARNP prescribe under Medicare Part D?
In 2024, Catherine Best Slack, ARNP had 69 Medicare Part D claims for 24 beneficiaries; the average among nurse practitioner prescribers was 1,109. 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.