Provider Profile
Gregory W Gerritsen, PhD
Unclaimed ProfileAbout Dr. Gerritsen
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Specialty
Credentials & Licensing
Source: NPPES NPI Registry
Contact Information
- (303) 473-4433
- Email not available
Practice Locations
2501 WALNUT ST SUITE 202
Boulder, CO 80302
Concerns and Conditions Addressed
Within Clinical Psychology generally. Availability varies by clinician, training and location — this profile has not been claimed, so nothing here is a personal claim by the provider.
Conditions
Most searched conditions
Procedures & services
Most searched procedures
Procedures Most Often Billed to Medicare
107 services · 13 patients · 1 distinct codes
| Procedure | Type | Code | Services |
|---|---|---|---|
| Psychotherapy, 1 hour | Treatment | 90837 |
107 |
Source: CMS Medicare public data. Shows how often procedures were billed — not quality of care or patient satisfaction.
Related providers
Connections drawn from the registry and from what providers have told us. A link here is not a referral or an endorsement.
Other psychologists at this location 1
Same specialty, same street address — most likely the same department or group.
Related specialists at this location 8
Clinically related specialties at the same address — the people this provider most likely works alongside.
Also at this address 4
Providers at the same street address. Each files their own registry entry, so a shared practice often appears under several different names.
More connections — 16 related providers in 2 groups
Other psychologists in Boulder 8
Same specialty, same city.
Also performs Psychotherapy, 1 hour 8
Providers in CO who bill this service to Medicare most often.
Common questions
What kind of doctor is Dr. Gerritsen?
Dr. Gerritsen is a psychologist in Boulder, CO. This is the primary taxonomy recorded against the NPI in the federal registry, listed there as “Psychologist — Clinical”.
NPI registry
What is Dr. Gerritsen's address?
Dr. Gerritsen is listed at 2501 WALNUT ST SUITE 202, Boulder, CO 80302. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
How can I make an appointment with Dr. Gerritsen?
The number on file is (303) 473-4433. Guide.md cannot book appointments or pass on messages — please call the office directly.
NPI registry
What is Dr. Gerritsen's NPI number?
Dr. Gerritsen's National Provider Identifier is 1083795686. It is issued by the Centers for Medicare & Medicaid Services and is unique and permanent — it does not change if they move practice.
NPI registry
How long has Dr. Gerritsen been practicing?
Dr. Gerritsen has 20+ years experience. Registered with an NPI since 2006. National Provider Identifiers only began in 2005, so a provider who qualified earlier may have practiced for longer than this.
NPI registry
What procedures does Dr. Gerritsen perform?
According to Medicare billing data, Dr. Gerritsen provides treatments such as psychotherapy, 1 hour. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Has Dr. Gerritsen confirmed this information?
Not yet. This profile is built from public federal data and has not been confirmed by Dr. Gerritsen. If this is you, claiming it is free.
Guide.md
Provider data sourced from the NPPES NPI Registry and CMS public datasets. Information is provided for reference and is not medical advice.