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MRS. TAMMY ANNE NICHOLSON LCMHC
NPI 1891088274
Counselor - Mental Health in Portsmouth, NH

Active since May 18, 2011PECOS EnrolledAccepts Medicare Assignment
100 EILEEN DONDERO FOLEY AVE STE 302, PORTSMOUTH, NH 03801(603) 883-0005 Get Directions Write a Review

NPPES record last updated: December 29, 2025. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Dec 29, 2025, Dec 9, 2024, Aug 10, 2019 (3 updates tracked since 2019).

About Mrs. Tammy Anne Nicholson Lcmhc NPPES

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

MRS. TAMMY ANNE NICHOLSON LCMHC (NPI 1891088274) is an individual mental health provider in Portsmouth, New Hampshire, licensed in New Hampshire (1154) and active in the NPI registry since May 2011. She is enrolled in Medicare PECOS, maintains 2 additional practice locations, and is a graduate of Other (2010).

NPPES Registry Identity

NPI1891088274
Entity TypeIndividualFemale
Primary Taxonomy101YM0800X
Provider Legal NameMRS. TAMMY ANNE NICHOLSONCredential: LCMHC
Location Address100 EILEEN DONDERO FOLEY AVE STE 302Portsmouth, NH 03801-4597
Mailing Address4800 N Scottsdale Rd Ste 2500Scottsdale, AZ 85251-7630
Phone(603) 883-0005
Sole ProprietorNo
Medical School CMSOtherGraduated 2010
Enumeration DateMay 18, 2011
Last NPPES UpdateDecember 29, 20253 updates tracked since enumeration
NPPES CertifiedDecember 29, 2025
✔ NPI 1891088274 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyCounselor · Mental HealthBehavioral Health & Social Service Providers
Taxonomy Code101YM0800X
License✔ Licensed in NH · 1154
Also ListedCounselor · Addiction (Substance Use Disorder)Taxonomy 101YA0400X · License 8421 (MA)
100 EILEEN DONDERO FOLEY AVE STE 302, Portsmouth, NH 03801
Open in Google Maps ↗

Secondary Practice Locations 2

Location 176 Winter StHaverhill, MA 01830-5760 · Phone (978) 373-1181 ext. 33
Location 216 Fifth StDover, NH 03820-2930 · Phone (603) 883-0005

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Anthem Blue Cross and Blue Shield, Harvard Pilgrim Health Care.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

Mrs. Tammy Anne Nicholson Lcmhc 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 ID7911342159
PECOS Enrollment IDI20240228000956
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 Reassignment

Medicare enrollment records show Tammy Nicholson reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

The Counseling Center Of Nashua Inc
41 mi
Clinical
1 MAIN ST
Nashua, NH 03064
  • Reassigned Medicare billing, New Hampshire enrollment
  • 216 clinicians in this Medicare group
NPI 1144275389 (603) 883-0005

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Other Providers at the Same Location NPPES 12

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

REBECCA RICHARDS PSY.D
Psychologist (Clinical)
100 EILEEN DONDERO FOLEY AVE STE 302
PORTSMOUTH, NH 03801
Rockingham County (603) 883-0005
KIMBERLY ORIFICI PSY.D.
Psychologist (Clinical)
100 EILEEN DONDERO FOLEY AVE STE 302
PORTSMOUTH, NH 03801
Rockingham County (603) 883-0005
CAROLINE THOMAS LICSW
Social Worker (Clinical)
100 EILEEN DONDERO FOLEY AVE STE 302
PORTSMOUTH, NH 03801
Rockingham County (603) 883-0005
MS. JENNIFER LH GAUDREAU L.I.C.S.W.
Social Worker (Clinical)
100 EILEEN DONDERO FOLEY AVE STE 302
PORTSMOUTH, NH 03801
Rockingham County (603) 883-0005
ALLIE HELFRICH MS
Counselor (Mental Health)
100 EILEEN DONDERO FOLEY AVE STE 302
PORTSMOUTH, NH 03801
Rockingham County (978) 979-6018
MARA DUTOIT LMFT
Marriage & Family Therapist
100 EILEEN DONDERO FOLEY AVE STE 302
PORTSMOUTH, NH 03801
Rockingham County (603) 883-0005
DR. JORDYN GRAVES DESCHENE PSYD
Psychologist (Clinical)
100 EILEEN DONDERO FOLEY AVE STE 302
PORTSMOUTH, NH 03801
Rockingham County (603) 883-0005
VICTORIA REVICH
Psychologist
100 EILEEN DONDERO FOLEY AVE STE 302
PORTSMOUTH, NH 03801
Rockingham County (603) 883-0005

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 Tammy Nicholson's NPI number?

The NPI number for Tammy Nicholson is 1891088274. It was assigned to this individual provider in the NPPES registry on May 18, 2011.

Where is Tammy Nicholson located?

Tammy Nicholson practices at 100 Eileen Dondero Foley Ave Ste 302, Portsmouth, NH 03801. The listed phone number is (603) 883-0005.

What is Tammy Nicholson's specialty?

The primary specialty registered for this NPI is Counselor, specializing in Mental Health, with taxonomy code 101YM0800X.

Is Tammy Nicholson enrolled in Medicare?

Yes. Tammy Nicholson 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 organization bills Medicare for Tammy Nicholson's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Tammy Nicholson reassigns Medicare benefits to The Counseling Center Of Nashua Inc (Nashua, NH). The 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 Tammy Nicholson's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Tammy Nicholson accept?

Health plans from Anthem Blue Cross and Blue Shield and Harvard Pilgrim Health Care list Tammy Nicholson 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 Tammy Nicholson was last updated on December 29, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 9 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.