Physician Profile
Unclaimed ProfileAbout CHELLSEN
John A Chellsen, PhD is a clinical psychologist based in Stockton, CA. John is also listed as specialising in psychologist — clinical.
Summarised automatically from public NPI registry and CMS Medicare data. Not written or reviewed by this provider. Claim this profile to replace it.
Education & Training
Areas of Expertise
Common questions
What is Dr. Chellsen's specialty?
Dr. Chellsen is a clinical psychologist in Stockton, CA. This is the primary taxonomy recorded against the NPI in the federal registry, listed there as “CLINICAL PSYCHOLOGIST”.
NPI registry
Where can I find Dr. Chellsen?
Dr. Chellsen is listed at 2155 W MARCH LN STE 2B, Stockton, CA 95207. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
How do I contact Dr. Chellsen?
The number on file is (209) 473-4211. Guide.md cannot book appointments or pass on messages — please call the office directly.
NPI registry
What is Dr. Chellsen's NPI number?
Dr. Chellsen's National Provider Identifier is 1669403580. 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
What is Dr. Chellsen's medical education?
Dr. Chellsen attended Other, graduating in 1983. This comes from the CMS National Downloadable File.
CMS public data
How long has Dr. Chellsen been practising?
Dr. Chellsen has 43 years experience. Calculated from a graduation year of 1983, reported in the CMS National Downloadable File.
CMS public data
What is Dr. Chellsen known for?
According to Medicare billing data, Dr. Chellsen 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. Chellsen confirmed this information?
Not yet. This profile is built from public federal data and has not been confirmed by Dr. Chellsen. If this is you, claiming it is free.
Guide.md
Licensing & Certification
Source: NPPES NPI Registry
Contact Information
- (209) 473-4211
- Email not available
Practice Locations
2155 W MARCH LN STE 2B
Stockton, CA 95207
Procedures Most Often Billed to Medicare
109 services · 12 patients · 1 distinct codes
| Procedure | Type | Code | Services |
|---|---|---|---|
| Psychotherapy, 1 hour | Treatment | 90837 |
109 |
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.
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.
Other clinical psychologists in Stockton 8
Same specialty, same city.
Trained at Other 8
Other providers in the same specialty who trained at the same institution.
More connections — 16 related providers in 2 groups
Class of 1983 at Other 8
Providers who graduated from the same medical school in the same year.
Also performs Psychotherapy, 1 hour 8
Providers in CA who bill this service to Medicare most often.
Provider data sourced from the NPPES NPI Registry and CMS public datasets. Information is provided for reference and is not medical advice.