Dr. John Peter Gruen, MD
- Industry payments
- $1,346
- Affiliated sites
- 1
- Medical group
- 1
- Insurance carriers
- 11
- State license
- 1
- Practice address
- 1520 San Pablo St Fl 4 Fl 4, Los Angeles, CA 90033-5310
- Practice phone
- Call (800) 872-2273
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Usc Care Medical Group - Primary Care - Los Angeles (San Pablo St)
Multi-specialty group site · Los Angeles, California
Find Dr. Gruen'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.
Dr. John Peter Gruen is a neurosurgeon in Los Angeles, California
Dr. Gruen practices at Usc Care Medical Group - Primary Care - Los Angeles (San Pablo St) in Los Angeles, California.
Dr. Gruen's NPI, 1194769570, was assigned on June 15, 2006. Dr. Gruen graduated from Vagelos College of Physicians and Surgeons in 1986. Dr. Gruen's California license number on file is G63324.
- NPI
- 1194769570NPI Registry (opens in a new tab)
- Medicare PAC ID
- 1153472014
- NPI enumeration date
- June 15, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (800) 872-2273
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 66
- Medical school graduation
- 1986
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. John Peter Gruen practices at 2 locations in Los Angeles, California
Dr. Gruen's primary practice is Usc Care Medical Group - Primary Care - Los Angeles (San Pablo St), at 1520 San Pablo St Fl 4 Fl 4, Los Angeles, CA 90033-5310. The practice phone is (800) 872-2273. The NPI Registry lists Dr. Gruen's practice address as 1500 N San Pablo St, Los Angeles, CA 90033.
- Usc Care Medical Group - Primary Care - Los Angeles (San Pablo St)Primary1520 San Pablo St Fl 4 Fl 4, Los Angeles, CA 90033-5310Phone(800) 872-2273
- NPI Registry address1500 N San Pablo St, Los Angeles, CA 90033 · Los Angeles CountyPhone(323) 442-5720
Sources: NPPES NPI Registry (CMS); Dmand AI Affiliation Data; Doctors and Clinicians National Downloadable File (CMS); and Dmand AI Practice Data
Dr. John Peter Gruen is affiliated with 1 site of care and 1 medical group
Dr. Gruen's primary practice is Usc Care Medical Group - Primary Care - Los Angeles (San Pablo St) in Los Angeles, California. The medical group on file is USC Care Medical Group.
Sources: Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dmand AI tracks the EHR system at Dr. John Peter Gruen's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Gruen practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Usc Care Medical Group - Primary Care - Los Angeles (San Pablo St) | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. John Peter Gruen is one of 846 neurosurgeons in California
Neurological surgery is Dr. Gruen's primary specialty in the NPI Registry, under taxonomy code 207T00000X. Dr. Gruen is board certified in neurological surgery by the American Board of Neurological Surgery. Dr. Gruen has a license on file in California.
Specialties and state licenses
- Neurological surgery, CaliforniaPrimary
Neurosurgeons near Dr. Gruen
Counts of neurosurgeons 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. John Peter Gruen's patients have a median age of 47
Across all payers, Dmand AI patient panel data puts Dr. Gruen's median patient age at 47, with 0% women.
Dr. Gruen's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 47
Patient panel by sex, all payers
- Women0%
- Men100%
Source: Dmand AI Patient Panel Data
How Dr. John Peter Gruen takes part in Medicare
Dr. Gruen 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)
Dr. John Peter Gruen received $1,346 in industry payments from 2016 to 2023
CMS Open Payments shows 18 general payments to Dr. Gruen from 11 drug and device companies from 2016 to 2023. Food and beverage make up the largest share, 85% of the total. Stryker Corporation paid the most, $279.
General payments to Dr. Gruen by program year, 2016 to 2023
General payments to Dr. Gruen by kind, 2016 to 2023
- Food and beverage$1,14585%
- Travel and lodging$20215%
Companies that paid Dr. Gruen the most, 2016 to 2023
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. John Peter Gruen graduated from Vagelos College of Physicians and Surgeons
Dr. Gruen graduated from Vagelos College of Physicians and Surgeons in 1986.
- Medical school
- Board certified in neurological surgery
Source: Dmand AI Professional Profile Data
Dr. John Peter Gruen accepts plans from 11 insurance carriers
Dr. Gruen is in network with 11 carriers, including Aetna, Blue Cross Blue Shield of Michigan and United Healthcare. Medicare plans come from the most carriers, 7. Check the plan with the practice before a visit.
- Aetna
- Blue Cross Blue Shield of Michigan
- United Healthcare
- Blue Cross Blue Shield of Massachusetts
- Elevance
- HCSC
- LA Care
- Regence Health Plans
- +3 more carriersWith a free account
Plan types Dr. Gruen accepts, by number of carriers
- Medicare7
- HMO6
- PPO6
- EPO3
- POS3
- Medicaid1
Source: Dmand AI Insurance Network Data
Sources for Dr. John Peter Gruen'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 Affiliation DataDoctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDoctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| 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) |
| 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. John Peter Gruen
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. John Peter Gruen's NPI number?
Dr. John Peter Gruen's NPI number is 1194769570. It was assigned on June 15, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. John Peter Gruen?
Dr. John Peter Gruen is a neurosurgeon in Los Angeles, California. The primary specialty in the NPI Registry is Neurological Surgery Physician (taxonomy code 207T00000X).
Where does Dr. John Peter Gruen practice?
Dr. Gruen practices at 1520 San Pablo St Fl 4 Fl 4, Los Angeles, CA 90033-5310. Dr. Gruen also practices at 1500 N San Pablo St, Los Angeles, CA 90033. Dr. Gruen's primary practice is Usc Care Medical Group - Primary Care - Los Angeles (San Pablo St) in Los Angeles, California.
What is Dr. John Peter Gruen's office phone number?
The practice phone on file for Dr. Gruen is (800) 872-2273.
What is Dr. John Peter Gruen's medical license number?
Dr. Gruen's California license number on file is G63324.
What medical group is Dr. John Peter Gruen part of?
Dr. Gruen is linked to USC Care Medical Group.
Does Dr. John Peter Gruen accept Medicare?
Yes. CMS lists Dr. Gruen as accepting Medicare assignment.
Is Dr. John Peter Gruen board certified?
Yes. Dr. Gruen is board certified in neurological surgery by the American Board of Neurological Surgery.
Where did Dr. John Peter Gruen go to medical school?
Dr. Gruen graduated from Vagelos College of Physicians and Surgeons in 1986.
Has Dr. John Peter Gruen received payments from drug or device companies?
CMS Open Payments shows $1,346 in general payments to Dr. Gruen from 11 companies from 2016 to 2023. The largest total came from Stryker Corporation.
How long has Dr. John Peter Gruen been practicing?
Dr. Gruen graduated from medical school in 1986, 40 years ago.
What insurance does Dr. John Peter Gruen accept?
Dr. Gruen is in network with 11 carriers, including Aetna, Blue Cross Blue Shield of Michigan and United Healthcare. Medicare plans come from the most carriers, 7. Check the plan with the practice before a visit.
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