WILLIAM MARK ALLEN M.D.
NPI 1821060369
Emergency Medicine in Middletown, CT
About William Mark Allen M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
WILLIAM MARK ALLEN M.D. (NPI 1821060369) is an individual emergency medicine provider in Middletown, Connecticut, licensed in Connecticut (034661) and active in the NPI registry since February 2006. He is enrolled in Medicare PECOS, is affiliated with Houston Methodist West Hospital, and is a graduate of University Of Texas Medical School At Houston (1992).
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 1
Accepted Insurance
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
William Mark Allen 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
2Medicare enrollment records show William Allen reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Cedar Park, TX 78613
- Reassigned Medicare billing, Texas enrollment
- 828 clinicians in this Medicare group
Austin, TX 78705
- Reassigned Medicare billing, Texas enrollment
- 1,511 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 4
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
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Houston Methodist West Hospital
Acute Care Hospitals · Houston, TXPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 06457 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
MIDDLETOWN, CT 06457
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 William Allen's NPI number?
The NPI number for William Allen is 1821060369. It was assigned to this individual provider in the NPPES registry on February 7, 2006.
Where is William Allen located?
William Allen practices at 28 Crescent St, Middletown, CT 06457. The listed phone number is (860) 344-6394.
What is William Allen's specialty?
The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.
Is William Allen enrolled in Medicare?
Yes. William Allen 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 William Allen's services?
According to the CMS Revalidation Reassignment List (October 2026 release), William Allen reassigns Medicare benefits to 2 organizations: Usacs Integrated Acute Care Services Of Texas, PLLC (Cedar Park, TX) and Travis County Emergency Physicians PA (Austin, TX). 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 William Allen's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does William Allen accept?
Health plans from Blue Cross and Blue Shield of Texas, Sendero Health Plans, Local Nonprofit and UnitedHealthcare list William Allen as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
Is William Allen affiliated with any hospitals?
According to CMS data, William Allen is affiliated with Houston Methodist West Hospital.
When was this NPI record last updated?
The NPPES record for William Allen was last updated on July 9, 2007. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 19 years 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.
# William Mark Allen, M.D. · NPI 1821060369
Emergency Medicine physician in Middletown, Connecticut. Individual provider, active in the CMS NPPES registry since February 7, 2006.
## Identity
- **NPI:** 1821060369 (Entity type: Individual)
- **Enumerated:** February 7, 2006
- **Primary specialty:** Emergency Medicine · taxonomy 207P00000X
- **State license:** 034661 (Connecticut)
- **Sole proprietor:** No
## Practice location
- **Address:** 28 CRESCENT ST, Middletown, CT 06457-3654
- **Phone:** (860) 344-6394 · **Fax:** (860) 344-6748
## 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:** 2 organizations under Medicare reassignment (form CMS-855R): Usacs Integrated Acute Care Services Of Texas, PLLC (NPI 1801300322, Cedar Park, TX); Travis County Emergency Physicians PA (NPI 1962440933, Austin, TX) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of Texas Medical School At Houston, class of 1992
## Record status
- **NPPES last updated:** July 9, 2007
- **Other identifiers:** Medicare UPIN G 15523 (CT)
---
Source: [NPI Profile](https://npiprofile.com/npi/1821060369) · Data from the CMS NPPES public registry.