Dr. Gregory J. Joy, MD
- Medicare services, 2018
- 29
- Part D claims, 2018
- 165
- Industry payments
- $1,941
- Medical group
- 1
- Insurance carriers
- 2
- Practice address
- 26991 Crown Valley Pkwy, Mission Viejo, CA 92691-6528
- Practice phone
- Call (949) 582-5430
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Medical group
Find Dr. Joy's professional email, personal email and mobile number
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Dr. Gregory J. Joy is an internist in Mission Viejo, California
Dr. Joy practices with Cornerstone Specialty Hospitals Tucson, a medical group.
Dr. Joy's NPI, 1942211651, was assigned on August 10, 2006. Dr. Joy graduated from UC San Diego School of Medicine in 1972. Dr. Joy's California license number on file is G25323.
- NPI
- 1942211651NPI Registry (opens in a new tab)
- NPI enumeration date
- August 10, 2006
- NPI status
- Active
- Practice phone
- (949) 582-5430
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Medical school graduation
- 1972
Sources: NPPES NPI Registry (CMS); and Dmand AI Professional Profile Data
Dr. Gregory J. Joy's practice address is in Mission Viejo, California
Dr. Joy's practice address in the NPI Registry is 26991 Crown Valley Pkwy, Mission Viejo, CA 92691-6528. The practice phone is (949) 582-5430.
- NPI Registry address26991 Crown Valley Pkwy, Mission Viejo, CA 92691-6528Phone(949) 582-5430
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Gregory J. Joy is affiliated with 1 medical group
Dr. Joy is part of Cornerstone Specialty Hospitals Tucson, a medical group in Louisville, Kentucky.
Source: Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Gregory J. Joy's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Joy practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Cornerstone Specialty Hospitals Tucson | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
Dmand AI maps EHR vendors, IT decision makers and buying committees across Cornerstone Specialty Hospitals Tucson and 6.2K+ hospitals, with verified contacts in the same login.
Dr. Gregory J. Joy is one of 16,751 internists in California
Internal medicine is Dr. Joy's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Joy is board certified in internal medicine by the American Board of Internal Medicine. Dr. Joy has a license on file in California.
Specialties and state licenses
- Internal medicine, CaliforniaPrimary
Internists near Dr. Joy
Counts of internists 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
Dr. Gregory J. Joy billed Medicare for 29 services in 2018
CMS data shows 29 Medicare services from Dr. Joy across 1 procedure code in 2018. Medicare paid $5,221 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Joy's Medicare services by type, 2017 to 2018
- 2017
- 2018
- Office and hospital visits
- 2017: 2022018: 2986%
- Tests and treatments
- 2017: 152018: 0100%
- Other services
- 2017: 612018: 0100%
- Surgery
- 2017: 132018: 0100%
Dr. Joy compared with the California median for internists, 2018
- Dr. Joy
- California median
- Medicare services
- 29vs 36192% below
- Part D claims
- 165vs 42161% below
Medians across 15,815 internists in California with Dmand AI profiles that report each measure.
Dr. Joy's most billed Medicare procedure codes, 2018
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Joy and other internists in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Gregory J. Joy's patients have a median age of 74
Across all payers, Dmand AI patient panel data puts Dr. Joy's median patient age at 74, with 37% women.
Dr. Joy's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 74
Patient panel by sex, all payers
- Women37%
- Men60%
Source: Dmand AI Patient Panel Data
Dr. Gregory J. Joy wrote 165 Medicare Part D claims in 2018
In 2018, Dr. Joy wrote 165 Medicare Part D claims. They cover 8 drugs, with $6,789 in total drug cost. In 2017, CMS named 3,419 claims across 80 drugs.
Dr. Joy's most prescribed drugs by claims, 2018
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Part D claims for drugs CMS names, 2017 to 2018
- 2017
- 2018
- Claims for drugs CMS names
- 2017: 3,4192018: 16595%
Drugs named by CMS: 8 in 2018, 80 in 2017.
Source: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026
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Dr. Gregory J. Joy received $1,941 in industry payments from 2016 to 2018
CMS Open Payments shows 137 general payments to Dr. Joy from 23 drug and device companies from 2016 to 2018. Food and beverage make up the largest share, 99% of the total. AstraZeneca Pharmaceuticals LP paid the most, $368.
General payments to Dr. Joy by program year, 2016 to 2018
General payments to Dr. Joy by kind, 2016 to 2018
- Food and beverage$1,92299%
- Speaker and faculty fees$191%
Companies that paid Dr. Joy the most, 2016 to 2018
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Gregory J. Joy graduated from UC San Diego School of Medicine
Dr. Joy graduated from UC San Diego School of Medicine in 1972.
- Medical school
- Board certified in internal medicine
Source: Dmand AI Professional Profile Data
Dr. Gregory J. Joy accepts plans from 2 insurance carriers
Dr. Joy is in network with 2 carriers, including Blue Cross Blue Shield of Massachusetts and HCSC. Medicare plans come from the most carriers, 2. Check the plan with the practice before a visit.
- Blue Cross Blue Shield of Massachusetts
- HCSC
Plan types Dr. Joy accepts, by number of carriers
- Medicare2
- PPO2
Source: Dmand AI Insurance Network Data
Sources for Dr. Gregory J. Joy'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 | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel Data |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| Insurance carriers and plan types | Dmand AI Insurance Network Data |
| 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 Dr. Gregory J. Joy
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Gregory J. Joy's NPI number?
Dr. Gregory J. Joy's NPI number is 1942211651. It was assigned on August 10, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Gregory J. Joy?
Dr. Gregory J. Joy is an internist in Mission Viejo, California. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Gregory J. Joy practice?
Dr. Joy practices at 26991 Crown Valley Pkwy, Mission Viejo, CA 92691-6528. Dr. Joy's primary practice is Cornerstone Specialty Hospitals Tucson, a medical group.
What is Dr. Gregory J. Joy's office phone number?
The practice phone on file for Dr. Joy is (949) 582-5430.
What is Dr. Gregory J. Joy's medical license number?
Dr. Joy's California license number on file is G25323.
What medical group is Dr. Gregory J. Joy part of?
Dr. Joy is part of Cornerstone Specialty Hospitals Tucson in Louisville, Kentucky.
Does Dr. Gregory J. Joy accept Medicare?
Yes. CMS data shows Dr. Joy billed Medicare for 29 services in 2018.
Is Dr. Gregory J. Joy board certified?
Yes. Dr. Joy is board certified in internal medicine by the American Board of Internal Medicine.
What services does Dr. Gregory J. Joy bill to Medicare?
In 2018, Dr. Joy's most billed Medicare services were critical care (99291).
Where did Dr. Gregory J. Joy go to medical school?
Dr. Joy graduated from UC San Diego School of Medicine in 1972.
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What drugs does Dr. Gregory J. Joy prescribe most?
In 2018 Medicare Part D data, Dr. Joy's most prescribed drugs by claims were Atorvastatin Calcium, Losartan Potassium and Omeprazole.
Has Dr. Gregory J. Joy received payments from drug or device companies?
CMS Open Payments shows $1,941 in general payments to Dr. Joy from 23 companies from 2016 to 2018. The largest total came from AstraZeneca Pharmaceuticals LP.
How long has Dr. Gregory J. Joy been practicing?
Dr. Joy graduated from medical school in 1972, 54 years ago.
What insurance does Dr. Gregory J. Joy accept?
Dr. Joy is in network with 2 carriers, including Blue Cross Blue Shield of Massachusetts and HCSC. Medicare plans come from the most carriers, 2. Check the plan with the practice before a visit.
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