ALESSA SOOK CROSSAN M.D.
NPI 1477848034
Ophthalmology - Retina Specialist in Warrenton, VA
About Alessa Sook Crossan M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
ALESSA SOOK CROSSAN M.D. (NPI 1477848034) is an individual retina specialist in Warrenton, Virginia, licensed in Virginia (0101262608) and active in the NPI registry since June 2011. She is enrolled in Medicare PECOS, is affiliated with Inova Fairfax Hospital, and maintains a secondary practice location in Sterling.
NPPES Registry Identity
Specialties & Licenses 2
Secondary Practice Location 1
Other Identifiers 1
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Alessa Sook Crossan M.d. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignments
3Medicare enrollment records show Alessa Crossan reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Warrenton, VA 20186
- Reassigned Medicare billing, Virginia enrollment
- 5 clinicians in this Medicare group
Lansdowne, VA 20176
- Reassigned Medicare billing, District of Columbia and Virginia enrollments
- 24 clinicians in this Medicare group
Fairfax, VA 22031
- Reassigned Medicare billing, District of Columbia enrollment
- 7 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Areas of Expertise CMS Part B claims 11
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Hospital Affiliations CMS Care Compare 2
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Inova Fairfax Hospital
Acute Care Hospitals · Falls Church, VAInova Fair Oaks Hospital
Acute Care Hospitals · Fairfax, VAPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 20186 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
Other Providers at the Same Location NPPES 6
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
WARRENTON, VA 20186
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Alessa Crossan's NPI number?
The NPI number for Alessa Crossan is 1477848034. It was assigned to this individual provider in the NPPES registry on June 12, 2011.
Where is Alessa Crossan located?
Alessa Crossan practices at 45 N Hill Dr Ste 202, Warrenton, VA 20186. The listed phone number is (540) 349-1882.
What is Alessa Crossan's specialty?
The primary specialty registered for this NPI is Ophthalmology, specializing in Retina Specialist, with taxonomy code 207WX0107X.
Is Alessa Crossan enrolled in Medicare?
Yes. Alessa Crossan is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organizations bill Medicare for Alessa Crossan's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Alessa Crossan reassigns Medicare benefits to 3 organizations: Virginia Retina Center LLC (Warrenton, VA), Dulles Eye Associates, P.C. (Lansdowne, VA) and James W Mattern Od, PLLC (Fairfax, VA). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Alessa Crossan's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is Alessa Crossan affiliated with any hospitals?
According to CMS data, Alessa Crossan is affiliated with Inova Fairfax Hospital and Inova Fair Oaks Hospital.
When was this NPI record last updated?
The NPPES record for Alessa Crossan was last updated on April 11, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 18 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Alessa Sook Crossan, M.D. · NPI 1477848034
Retina Specialist physician in Warrenton, Virginia. Individual provider, active in the CMS NPPES registry since June 12, 2011.
## Identity
- **NPI:** 1477848034 (Entity type: Individual)
- **Enumerated:** June 12, 2011
- **Primary specialty:** Ophthalmology - Retina Specialist · taxonomy 207WX0107X
- **State license:** 0101262608 (Virginia)
- **Sole proprietor:** No
## Practice location
- **Address:** 45 N HILL DR STE 202, Warrenton, VA 20186-2677
- **Phone:** (540) 349-1882
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 3 organizations under Medicare reassignment (form CMS-855R): Virginia Retina Center LLC (NPI 1093869976, Warrenton, VA); Dulles Eye Associates, P.C. (NPI 1144289661, Lansdowne, VA); James W Mattern Od, PLLC (NPI 1376288597, Fairfax, VA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Albert Einstein College Of Medicine Of Yeshiva University, class of 2011
## Record status
- **NPPES last updated:** April 11, 2025
- **Other identifiers:** Medicaid 30016106580001 (VA)
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Source: [NPI Profile](https://npiprofile.com/npi/1477848034) · Data from the CMS NPPES public registry.