DR. WILLIAM J ENNIS III MD
NPI 1356447254
Anesthesiology in Concord, NH
About Dr. William J Ennis Iii Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. WILLIAM J ENNIS III MD (NPI 1356447254) is an individual anesthesiology provider in Concord, New Hampshire, licensed in New Hampshire (9150) and active in the NPI registry since September 2006. He is enrolled in Medicare PECOS, is affiliated with Concord Hospital, and maintains 2 additional practice locations.
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Locations 2
Other Identifiers 3
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
Dr. William J Ennis Iii Md 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 William Ennis reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Concord, NH 03301
- Reassigned Medicare billing, New Hampshire enrollment
- 62 clinicians in this Medicare group
Concord, NH 03301
- Reassigned Medicare billing, New Hampshire enrollment
- 98 clinicians in this Medicare group
Waltham, MA 02451
- Reassigned Medicare billing, New Hampshire enrollment
- 121 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.
Hospital Affiliations CMS Care Compare
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Concord Hospital
Acute Care Hospitals · Concord, NHOther Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
CONCORD, NH 03301
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 Ennis's NPI number?
The NPI number for William Ennis is 1356447254. It was assigned to this individual provider in the NPPES registry on September 16, 2006.
Where is William Ennis located?
William Ennis practices at 250 Pleasant St, Concord, NH 03301. The listed phone number is (603) 789-9103.
What is William Ennis's specialty?
The primary specialty registered for this NPI is Anesthesiology with taxonomy code 207L00000X.
Is William Ennis enrolled in Medicare?
Yes. William Ennis 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 Ennis's services?
According to the CMS Revalidation Reassignment List (October 2026 release), William Ennis reassigns Medicare benefits to 3 organizations: Concord Orthopaedics Professional Association (Concord, NH), Anesthesia Associates Professional Association (Concord, NH) and Northeast Orthopaedic Alliance PLLC (Waltham, MA). 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 Ennis's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does William Ennis accept?
Health plans from Taro Health and WellSense Health Plan list William Ennis 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 Ennis affiliated with any hospitals?
According to CMS data, William Ennis is affiliated with Concord Hospital.
When was this NPI record last updated?
The NPPES record for William Ennis was last updated on September 26, 2024. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 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.
# Dr. William J Ennis III, MD · NPI 1356447254
Anesthesiology physician in Concord, New Hampshire. Individual provider, active in the CMS NPPES registry since September 16, 2006.
## Identity
- **NPI:** 1356447254 (Entity type: Individual)
- **Enumerated:** September 16, 2006
- **Primary specialty:** Anesthesiology · taxonomy 207L00000X
- **State license:** 9150 (New Hampshire)
- **Sole proprietor:** No
## Practice location
- **Address:** 250 PLEASANT ST, Concord, NH 03301-2598
- **Phone:** (603) 789-9103 · **Fax:** (603) 227-7832
## 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): Concord Orthopaedics Professional Association (NPI 1437182490, Concord, NH); Anesthesia Associates Professional Association (NPI 1881791150, Concord, NH); Northeast Orthopaedic Alliance PLLC (NPI 1417724170, Waltham, MA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 1988
## Record status
- **NPPES last updated:** September 26, 2024
- **Other identifiers:** Other 0109559Y0NH03 (NH); Other 8060319 (NH); Medicaid 30006777 (NH)
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Source: [NPI Profile](https://npiprofile.com/npi/1356447254) · Data from the CMS NPPES public registry.