Alexander Castiello, MD
Pathology (CMS) · Mount Vernon, WA
At a glance
111 S 12Th St Ste D, Mount Vernon, WA 98274-4000
NPPES record updated Jun 14, 2022. Public records can lag behind changes at a practice.
Before you call: a quick checklist
- Are you accepting new patients?
- Do you accept my specific insurance plan?
- Do you provide the service I need at this address?
- Do I need a referral, and what is the earliest appointment?
Insurance participation and appointment availability are not established by these public records.
Medicare & insurance
Insurance participation is not established by these public records. Ask the practice and your insurer about your specific plan and this location.
How to check your coverage
Use your plan’s provider directory or the member-services number on your insurance card. Confirm the clinician, practice address, service, and whether a referral is required. A missing opt-out record does not establish Medicare acceptance.
Check the official Medicare directory ↗Practice location
111 S 12Th St Ste DMount Vernon, WA 98274-4000
Additional reported practice locations
3614 Meridian St Ste 100Bellingham, WA 982251748
Phone: 3607342800
Fax: 3607343818 3548 Meridian St Ste 101
Bellingham, WA 982251710
Phone: 3607342800
Fax: 3607343818
Education & affiliations
- Medical / professional school
- University Of South Florida College Of Medicine
- Graduation year
- 1994
- CMS specialties
- Pathology
Practice groups
Reported hospital affiliations
- Murray-Calloway County Hospital Murray, KY
- Tristar Greenview Regional Hospital Bowling Green, KY
Graduation year does not establish years in practice. A reported affiliation does not establish employment, current admitting privileges, or insurance participation.
Source: CMS National Downloadable File · Published Oct 15, 2026.
Source: CMS Facility Affiliation Data · Published Oct 15, 2026.
Procedures in the public data
Reported activity can help you ask more informed questions about a practice’s services.
No displayed procedure-category record in this release. This does not mean the clinician performs no procedures.
CMS uses a one-year claims window with a reporting lag. Counts cover the Medicare activity included by CMS, not all patients. “1–10” is a published range. Volume is not a quality or outcomes score. Coverage and methodology
Source: CMS Utilization Data · Published Oct 15, 2026.
Service-mix comparison is unavailable for this NPI in the imported Medicare service file.
Industry-reported general payments
No matching general-payment summary in the imported release. This is not a verified zero and does not rule out other payment types or years.
Source: CMS 2025 payments grouped by covered recipient and nature of payments · Published Jun 30, 2026.
Professional details: NPI, taxonomy & registry record
Registry details
- Primary taxonomy
- Pathology (CMS)
- Taxonomy code
- 207ZP0102X
- Enumeration date
- Jun 15, 2006
- Record updated
- Jun 14, 2022
More registry details
- Provider type
- Individual · Type 1
- Reported credentials
- MD
Reported taxonomies and licenses
207ZP0102X
License reported: 192330 AK
207ZP0102X
License reported: 46633 KY
207ZP0102X
License reported: MD40440 TN
207ZP0102X · Primary
License reported: IMLC.MD.61277913 WA
License numbers and credentials are reported to NPPES; HCPList does not independently verify them.
Practice location
111 S 12Th St Ste DMount Vernon, WA 98274-4000
- Phone
- (360) 734-2800
- Fax
- (360) 734-3818
Mailing address
3560 MERIDIAN ST STE 101BELLINGHAM, WA 982251731
Information may be outdated or incomplete. Confirm details directly with the practice. HCPList is an independent directory and is not affiliated with CMS.
Report a directory issue