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NICHOLAS TZAVALAS M.D.
NPI 1255319687
Anesthesiology in Derry, NH

Active since January 05, 2006PECOS EnrolledAccepts Medicare Assignment
1 PARKLAND DR, DERRY, NH 03038(603) 421-2163 Get Directions Write a Review

NPPES record last updated: August 8, 2007. Verified against the NPPES registry weekly; last sync: October 18, 2026.

About Nicholas Tzavalas M.d. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

NICHOLAS TZAVALAS M.D. (NPI 1255319687) is an individual anesthesiology provider in Derry, New Hampshire, licensed in New Hampshire (7382) and active in the NPI registry since January 2006. He is enrolled in Medicare PECOS and is a graduate of Other (1979).

NPPES Registry Identity

NPI1255319687
Entity TypeIndividualMale
Primary Taxonomy207L00000X
Provider Legal NameNICHOLAS TZAVALASCredential: M.D.
Location Address1 PARKLAND DRDerry, NH 03038-2746
Mailing AddressPo Box 1849Lewiston, ME 04241-1849 · (207) 784-2554 · Fax (207) 777-5363
Phone(603) 421-2163
Sole ProprietorNo
Medical School CMSOtherGraduated 1979
Enumeration DateJanuary 5, 2006
Last NPPES UpdateAugust 8, 2007
✔ NPI 1255319687 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyAnesthesiologyAllopathic & Osteopathic Physicians
Taxonomy Code207L00000X
License✔ Licensed in NH · 7382
Definition
An anesthesiologist is trained to provide pain relief and maintenance, or restoration, of a stable condition during and immediately following an operation or an obstetric or diagnostic procedure. The anesthesiologist assesses the risk of the patient undergoing surgery and optimizes the patient's condition prior to, during and after surgery. In addition to these management responsibilities, the anesthesiologist provides medical management and consultation in pain management and critical care medicine. Anesthesiologists diagnose and treat acute, long-standing and cancer pain problems; diagnose and treat patients with critical illnesses or severe injuries; direct resuscitation in the care of patients with cardiac or respiratory emergencies, including the need for artificial ventilation; and supervise post-anesthesia recovery.
1 PARKLAND DR, Derry, NH 03038
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Other Identifiers 1

Medicare UPINB86074

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Taro Health, WellSense Health Plan.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

Nicholas Tzavalas 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.

PECOS PAC ID4688621295
PECOS Enrollment IDI20050406000261
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignments

3

Medicare enrollment records show Nicholas Tzavalas reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Amoskeag Anesthesia, PLLC
9.5 mi
Anesthesiology
1 ELLIOT WAY, SUITE 200
Manchester, NH 03103
  • Reassigned Medicare billing, New Hampshire enrollment
  • 278 clinicians in this Medicare group
NPI 1104883511 (603) 663-2315
Apollo Medical Group Of Portsmouth PLLC
30 mi
Anesthesiology
291 SHATTUCK WAY
Newington, NH 03801
  • Reassigned Medicare billing, New Hampshire enrollment
  • 22 clinicians in this Medicare group
NPI 1023780657 (561) 330-3381
Apollo Medical Group Of Wentworth PLLC
35 mi
Anesthesiology
6 WORKS WAY
Somersworth, NH 03878
  • Reassigned Medicare billing, New Hampshire enrollment
  • 29 clinicians in this Medicare group
NPI 1831748185 (603) 285-9273

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.

Anesthesia for other procedure on large bowel using an endoscope 00811
Anesthesia for an endoscopic procedure on the large bowel ensures comfort and relaxation during the procedure. You'll be given medication to make you drowsy or asleep, eliminating any discomfort. The medication can be administered through a vein or inhaled.
38 services37 patients
Anesthesia for lens surgery 00142
Anesthesia for lens surgery involves administering medication to numb the eye area, ensuring you feel no pain during the procedure. This can be a local anesthetic (numbing only the eye area) or general (where you're asleep). It helps make the surgery comfortable and stress-free.
16 services16 patients
Anesthesia for other procedure on esophagus, stomach, or upper small bowel using an endoscope 00731
This procedure involves the use of an endoscope, a flexible tube with a light and camera, to examine your esophagus, stomach, or upper small bowel. Anesthesia ensures you are comfortable and pain-free during the procedure.
15 services15 patients
Anesthesia for exam of colon using an endoscope 00812
Anesthesia for a colon examination with an endoscope is a method used to ensure comfort during the procedure. It involves administering medication to help you relax or sleep, thus reducing discomfort as the endoscope, a thin, flexible tube, is navigated through your colon.
13 services13 patients

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.

RUNNING BROOK EMERGENCY PHYSICIANS, LLC
Emergency Medicine
1 PARKLAND DR
DERRY, NH 03038
Rockingham County (603) 432-1500
DR. MARIA MICHELLE DIAZ M.D.
Emergency Medicine
1 PARKLAND DR
DERRY, NH 03038
Rockingham County (603) 421-2220
DAVID M BRYSON PA-C
Physician Assistant (Medical)
1 PARKLAND DR
DERRY, NH 03038
Rockingham County (603) 421-2220
HCA HEALTH SERVICES OF NEW HAMPSHIRE, INC.
Psychiatric Unit
1 PARKLAND DR
DERRY, NH 03038
Rockingham County (603) 432-1500
MARIA MAGDALENA RIVERA PA
Physician Assistant
1 PARKLAND DR, EMERGENCY DEPARTMENT
DERRY, NH 03038
Rockingham County (603) 432-1500
NUTFIELD ANESTHESIA ASSOCIATES, P.A.
Anesthesiology
1 PARKLAND DR
DERRY, NH 03038
Rockingham County (603) 421-2476
EDWARD MORGENTHAU PA-C
Physician Assistant
1 PARKLAND DR
DERRY, NH 03038
Rockingham County (603) 432-1500
HCA HEALTH SERVICES OF NEW HAMPSHIRE, INC.
General Acute Care Hospital
1 PARKLAND DR
DERRY, NH 03038
Rockingham County (603) 432-1500

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 Nicholas Tzavalas's NPI number?

The NPI number for Nicholas Tzavalas is 1255319687. It was assigned to this individual provider in the NPPES registry on January 5, 2006.

Where is Nicholas Tzavalas located?

Nicholas Tzavalas practices at 1 Parkland Dr, Derry, NH 03038. The listed phone number is (603) 421-2163.

What is Nicholas Tzavalas's specialty?

The primary specialty registered for this NPI is Anesthesiology with taxonomy code 207L00000X.

Is Nicholas Tzavalas enrolled in Medicare?

Yes. Nicholas Tzavalas 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 Nicholas Tzavalas's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Nicholas Tzavalas reassigns Medicare benefits to 3 organizations: Amoskeag Anesthesia, PLLC (Manchester, NH), Apollo Medical Group Of Portsmouth PLLC (Newington, NH) and Apollo Medical Group Of Wentworth PLLC (Somersworth, NH). 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 Nicholas Tzavalas's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Nicholas Tzavalas accept?

Health plans from Taro Health and WellSense Health Plan list Nicholas Tzavalas 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.

When was this NPI record last updated?

The NPPES record for Nicholas Tzavalas was last updated on August 8, 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.