John E. Mayer, PhD
- Affiliated sites
- 3
- Medical group
- 1
- State license
- 1
- Year NPI issued
- 2007
- Practice address
- 1 California St, San Francisco, CA 94111
- Practice phone
- Call (800) 997-6196
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Doctor on Demand
Urgent Care Center · San Francisco, California
Find John Mayer's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
John E. Mayer is a clinical psychologist in San Francisco, California
John Mayer practices at Doctor on Demand in San Francisco, California.
John Mayer's NPI, 1790816841, was assigned on March 8, 2007. John Mayer holds Illinois license 071-02554.
- NPI
- 1790816841NPI Registry (opens in a new tab)
- Medicare PAC ID
- 0648284307
- NPI enumeration date
- March 8, 2007
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (800) 997-6196
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 73
- Medical school graduation
- 1979
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
John E. Mayer practices at Doctor on Demand in San Francisco, California
John Mayer's primary practice is Doctor on Demand, at 1 California St, San Francisco, CA 94111. The practice phone is (800) 997-6196.
- Doctor on Demand1 California St, San Francisco, CA 94111Phone(800) 997-6196
Source: Dmand AI Affiliation Data
John E. Mayer is affiliated with 3 sites of care and 1 medical group
John Mayer's primary practice is Doctor on Demand in San Francisco, California. The medical group on file is Doctor on Demand. Dmand AI also links John Mayer to 1 more physician office and 1 group practice or clinic, each named with a free account. John Mayer's employer is on file too: an urgent care center.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at John E. Mayer's practice
Dmand AI tracks the electronic health record (EHR) system at each site where John Mayer practices, 3 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Doctor on Demand | Available with a free account |
| +2 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
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John E. Mayer is one of 3,615 clinical psychologists in California
Clinical is John Mayer's primary specialty in the NPI Registry, under taxonomy code 103TC0700X. John Mayer is licensed in Illinois.
Specialties and state licenses
- Clinical psychologist, IllinoisPrimary
Clinical psychologists near John Mayer
Counts of clinical psychologists with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
John E. Mayer's patients have a median age of 38
Across all payers, Dmand AI patient panel data puts John Mayer's median patient age at 38, with 65% women.
John Mayer's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 38
Patient panel by sex, all payers
- Women65%
- Men33%
Source: Dmand AI Patient Panel Data
How John E. Mayer takes part in Medicare
John Mayer accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
Sources for John E. Mayer's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel Data |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about John E. Mayer
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is John E. Mayer's NPI number?
John E. Mayer's NPI number is 1790816841. It was assigned on March 8, 2007, and it is active in the NPI Registry.
What does John E. Mayer specialize in?
John E. Mayer is a clinical psychologist in San Francisco, California. The primary specialty in the NPI Registry is Clinical Psychologist (taxonomy code 103TC0700X).
Where does John E. Mayer practice?
John Mayer practices at 1 California St, San Francisco, CA 94111. John Mayer's primary practice is Doctor on Demand in San Francisco, California. Dmand AI also links John Mayer to 1 physician office and 1 group practice or clinic.
What is John E. Mayer's office phone number?
The practice phone on file for John Mayer is (800) 997-6196.
What is John E. Mayer's medical license number?
John Mayer holds Illinois license 071-02554.
What medical group is John E. Mayer part of?
John Mayer is linked to Doctor on Demand.
Does John E. Mayer accept Medicare?
Yes. CMS lists John Mayer as accepting Medicare assignment.
How long has John E. Mayer been practicing?
John Mayer graduated from medical school in 1979, 47 years ago.
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