Christyn Sieve Psyd Psychological Services PLLC
NPI 1326636903 · Adult Mental Health Clinic/Center · Portsmouth, NH
Enrolled with Medicare as Part B Supplier - Clinic/Group Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Christyn Sieve Psyd Psychological Services PLLC is a Adult Mental Health Clinic/Center organization in Portsmouth, NH (NPI 1326636903).
Provider details
- NPI number
- 1326636903
- Entity type
- Organization
- Primary specialty
- Adult Mental Health Clinic/CenterAmbulatory Health Care Facilities
- Organization subpart
- No
- Authorized official
- Christyn Sieve, Clinical Psychologist(603) 498-1575
Specialties & taxonomies
Ambulatory Health Care Facilities
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
5 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
Mailing address
Registry dates
- Enumerated
- 2021-01-08
- Last updated
- 2021-01-08
- Certified
- 2021-01-08
Frequently asked questions
- What is Christyn Sieve Psyd Psychological Services PLLC's NPI number?
- Christyn Sieve Psyd Psychological Services PLLC's National Provider Identifier (NPI) is 1326636903, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What type of organization is Christyn Sieve Psyd Psychological Services PLLC?
- Christyn Sieve Psyd Psychological Services PLLC is classified in the NPPES registry as Adult Mental Health Clinic/Center (Ambulatory Health Care Facilities).
- Where is Christyn Sieve Psyd Psychological Services PLLC located?
- Christyn Sieve Psyd Psychological Services PLLC's practice location on file with NPPES is 439 Middle St, Portsmouth, NH 03801-5080.
- What is Christyn Sieve Psyd Psychological Services PLLC's phone number?
- The practice phone number listed in the NPPES registry for Christyn Sieve Psyd Psychological Services PLLC is (603) 498-1575.
- Does Christyn Sieve Psyd Psychological Services PLLC accept Medicare?
- Christyn Sieve Psyd Psychological Services PLLC is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Who is the authorized official for Christyn Sieve Psyd Psychological Services PLLC?
- The authorized official listed on Christyn Sieve Psyd Psychological Services PLLC's NPPES record is Christyn Sieve, Clinical Psychologist. The authorized official registers and maintains the organization's NPI and is not necessarily its owner.
- Is Christyn Sieve Psyd Psychological Services PLLC's NPI active?
- Yes — Christyn Sieve Psyd Psychological Services PLLC's NPI (1326636903) is active in the NPPES registry as of the last update on 2021-01-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.