Ruth Mayer, PH.D.
Ruth Mayer, PH.D. is an Addiction (Substance Use Disorder) Psychologist in Woodbury, CT, registered under NPI 1780707059. This provider registers 7 separate taxonomy codes, which usually means they practise across more than one recognised specialty. NPPES records them as a sole proprietor, meaning the practice is not incorporated as a separate legal entity.
Getting there
The practice address on file is 1080 MAIN ST S SUITE 5, Woodbury, CT 06798. We have not yet mapped what surrounds this office — parking, transit, and nearby pharmacies are added as our data collection reaches each location.
Credentials and Medicare
| Licence | State | Specialty |
|---|---|---|
| 001542 | CT | Addiction (Substance Use Disorder)… primary |
| 001542 | CT | Psychologist |
| 008618-1 | NY | Psychologist |
| 001542 | CT | Cognitive & Behavioral Psychologist |
| 001542 | CT | Clinical Psychologist |
| 001542 | CT | Clinical Child & Adolescent Psychologist |
| 001542 | CT | Family Psychologist |
| 001542 | CT | Health Service Psychologist |
Licences are recorded in 2 states: CT, NY. Providers licensed in several states often practise near a state border or deliver telehealth across state lines.
- Status
- Approved
- Provider type
- Practitioner - Clinical Psychologist
- PAC ID
- 6800827429
- Enrollment ID
- I20050824000055
Medicare enrolment is recorded as approved under the provider type Practitioner - Clinical Psychologist. Being enrolled means the provider can bill Medicare; it does not tell you whether they are currently accepting new Medicare patients. Call the office to confirm.
Licensed in 2 states
This provider holds licences in 2 states: Connecticut and New York. The practice address on file is in Woodbury, CT, but a licence in another state usually means they see patients there too — either at a second location or by telehealth. If the address above is far from you, it is worth calling to ask whether they practise closer to where you live.
- Licence
- 001542
- Specialty
- Addiction (Substance Use Disorder)…
Licence numbers are self-reported to NPPES at registration. They do not confirm a licence is currently active, in good standing, or valid for the specialty shown — only the state board can tell you that, which is why we link to each one.
What Addiction (Substance Use Disorder) covers
A psychologist with a proficiency that involves the application of psychological treatment of addiction stemming from the use of alcohol and other psychoactive substances (e.g., nicotine, marijuana, cocaine, heroin) or behavioral addictions (e.g., gambling) with the aim of cessation or reduction of use and/or the amelioration of emotional, behavioral, interpersonal and other problems arising from the addictive behavior. NUCC Health Care Provider Taxonomy, code 103TA0400X
All registered taxonomy codes
This provider registers 8 taxonomy codes. The primary code is what appears on most claims; the others record additional recognised specialties.
| Code | Specialty | Licence | State | |
|---|---|---|---|---|
| 103TA0400X | Addiction (Substance Use Disorder) Psychologist Addiction (Substance Use Disorder) | 001542 | CT | primary |
| 103T00000X | Psychologist | 001542 | CT | |
| 103T00000X | Psychologist | 008618-1 | NY | |
| 103TB0200X | Cognitive & Behavioral Psychologist Cognitive & Behavioral | 001542 | CT | |
| 103TC0700X | Clinical Psychologist Clinical | 001542 | CT | |
| 103TC2200X | Clinical Child & Adolescent Psychologist Clinical Child & Adolescent | 001542 | CT | |
| 103TF0000X | Family Psychologist Family | 001542 | CT | |
| 103TH0100X | Health Service Psychologist Health Service | 001542 | CT |
The taxonomy records how the provider classifies their own practice. It does not confirm which conditions they currently treat, whether they are accepting new patients, or which insurance they take — call the office for that.
Full NPPES record
An NPI-1 identifies a single person. It stays with the clinician for life, even if they move practice or change state, which is why the address on file can lag behind where they actually work today.
| NPI | 1780707059 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Apr 9, 2007 |
| Last updated | Sep 11, 2025 |
| Status | Active |
| Sole proprietor | Yes |
| Credential | PH.D. |
| Practice address |
1080 MAIN ST S SUITE 5 Woodbury, CT 06798 (203) 263-8878 Fax (203) 758-2329 |
| Mailing address |
59 JUDD HILL RD Woodbury, CT 06798 |
Number check
How the check works, step by step
Every NPI carries a Luhn check digit — the same scheme used on credit cards. CMS prefixes the number with 80840 before computing it, which marks it as a US health identifier.
| Digit | 8 | 0 | 8 | 4 | 0 | 1 | 7 | 8 | 0 | 7 | 0 | 7 | 0 | 5 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 7 | 7 | 0 | 5 | 0 | 5 | 0 | 1 |
Sum = 51 · next multiple of 10 = 60 · check digit = 9 · actual last digit = 9
A valid check digit only means the number is well-formed. It does not mean the provider is licensed, active, or in good standing — those are separate questions answered by the sections above.