Dr. Gustavo J. Marks, MD
- Medicare services, 2024
- 741
- Medicare patients, 2024
- 100
- Part D claims, 2024
- 1,348
- Industry payments
- $6,287
- Affiliated sites
- 1
- Practice address
- 22030 Sherman Way #318 #318, Canoga Park, CA 91303
- Practice phone
- Call (818) 999-5900
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Valley View Medical Clinic
Physician office · Canoga Park, California
Find Dr. Marks' 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. Gustavo J. Marks is a family medicine physician in Canoga Park, California
Dr. Marks practices at Valley View Medical Clinic in Canoga Park, California.
Dr. Marks' NPI, 1740373315, was assigned on October 2, 2006. Dr. Marks graduated from University of Buenos Aires in 1986. Dr. Marks' California license number on file is A54483.
- NPI
- 1740373315NPI Registry (opens in a new tab)
- NPI enumeration date
- October 2, 2006
- NPI status
- Active
- Practice phone
- (818) 999-5900
- 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; and Dmand AI Affiliation Data
Dr. Gustavo J. Marks practices at Valley View Medical Clinic in Canoga Park, California
Dr. Marks' primary practice is Valley View Medical Clinic, at 22030 Sherman Way #318 #318, Canoga Park, CA 91303. The practice phone is (818) 999-5900.
- Valley View Medical Clinic22030 Sherman Way #318 #318, Canoga Park, CA 91303Phone(818) 999-5900
Source: Dmand AI Affiliation Data
Dr. Gustavo J. Marks is affiliated with 1 site of care
Dr. Marks' primary practice is Valley View Medical Clinic in Canoga Park, California.
Source: Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Gustavo J. Marks' practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Marks practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Valley View Medical Clinic | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Gustavo J. Marks is one of 15,680 family medicine physicians in California
Family medicine is Dr. Marks' primary specialty in the NPI Registry, under taxonomy code 207Q00000X. Dr. Marks has a license on file in California.
Specialties and state licenses
- Family medicine, CaliforniaPrimary
Clinical focus
Dmand AI lists acid reflux, acute sinusitis, adjustment disease, aneurysm, anxiety, arthritis, asthma and atrial fibrillation and flutter among the conditions Dr. Marks treats.
Family medicine physicians near Dr. Marks
Counts of family medicine physicians 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. Gustavo J. Marks billed Medicare for 741 services in 2024
CMS data shows 741 Medicare services from Dr. Marks across 11 procedure codes in 2024, for 100 Medicare patients. Medicare paid $55,782 for them. Every service was in an office.
Dr. Marks' Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 1,8292024: 51372%
- Tests and treatments
- 2023: 1242024: 1283%
- Imaging
- 2023: 02024: 38
- Drugs given in the office
- 2023: 1,7912024: 3398%
- Surgery
- 2023: 2242024: 2987%
- Lab and pathology
- 2023: 432024: 0100%
- Other services
- 2023: 252024: 0100%
Dr. Marks compared with the California median for family medicine physicians, 2024
- Dr. Marks
- California median
- Medicare services
- 741vs 2463.0 times
- Medicare patients
- 100vs 11815% below
- Part D claims
- 956vs 83315% above
Medians across 15,349 family medicine physicians in California with Dmand AI profiles that report each measure.
Dr. Marks' most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
Need commercial claims for Dr. Marks?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Marks and other family medicine physicians in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Gustavo J. Marks treated 100 Medicare patients in 2024, average age 77
CMS counts 100 Medicare patients who saw Dr. Marks in 2024. The largest group is 65 to 74, with 40 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 62% are also on Medicaid. Their average risk score is 1.37, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Marks' median patient age at 66, with 48% women.
Dr. Marks' Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Marks' Medicare patients by sex, 2024
- Women6363%
- Men3737%
Chronic conditions among Dr. Marks' Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis61%
- Diabetes50%
- Anxiety38%
- Ischemic heart disease36%
- Mood disorders32%
- Depression29%
Share of Medicare patients with each condition. A patient can have several.
Dr. Marks' patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 66
Patient panel by sex, all payers
- Women48%
- Men50%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Gustavo J. Marks wrote 1,348 Medicare Part D claims in 2024
In 2024, Dr. Marks wrote 1,348 Medicare Part D claims for 102 patients. 84% of them were for generic drugs. CMS names the drug for 956 of them, across 43 drugs with 11 or more claims each, at $48,989 in total drug cost. In 2023, CMS named 1,694 claims across 57 drugs.
Dr. Marks' Part D claims by kind of drug, 2024
- Generic1,133 claims84%
- Brand-name and other215 claims16%
Dr. Marks' most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Dr. Marks' Part D claims, 2024
- Opioids1%12 of 1,348 claims
- Antibiotics2%22 of 1,348 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 1,6942024: 95644%
Drugs named by CMS: 43 in 2024, 57 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
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Dr. Gustavo J. Marks received $6,287 in industry payments from 2016 to 2024
CMS Open Payments shows 232 general payments to Dr. Marks from 27 drug and device companies from 2016 to 2024. Food and beverage make up the largest share, 99% of the total. AstraZeneca Pharmaceuticals LP paid the most, $988.
General payments to Dr. Marks by program year, 2016 to 2024
General payments to Dr. Marks by kind, 2016 to 2024
- Food and beverage$6,22199%
- Education$661%
Companies that paid Dr. Marks the most, 2016 to 2024
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Gustavo J. Marks has 1 award and honors on record
Dmand AI lists 1 award for Dr. Marks, most recently CMS Stage 1 EHR in 2013.
Awards and honors for Dr. Marks
- 2013
- CMS Stage 1 EHR
Source: Dmand AI Professional Profile Data
Dr. Gustavo J. Marks graduated from University of Buenos Aires
Dr. Marks graduated from University of Buenos Aires in 1986.
- Medical school
Source: Dmand AI Professional Profile Data
Dr. Gustavo J. Marks accepts plans from 4 insurance carriers
Dr. Marks is in network with 4 carriers, including Blue Cross Blue Shield of Michigan, Blue Cross Blue Shield of Massachusetts and HCSC. Medicare plans come from the most carriers, 4. Check the plan with the practice before a visit.
- Blue Cross Blue Shield of Michigan
- Blue Cross Blue Shield of Massachusetts
- HCSC
- Regence Health Plans
Plan types Dr. Marks accepts, by number of carriers
- Medicare4
- PPO4
- HMO1
- POS1
Source: Dmand AI Insurance Network Data
Sources for Dr. Gustavo J. Marks'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 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 DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Awards and committee roles | Dmand AI Professional Profile Data |
| 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. Gustavo J. Marks
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. Gustavo J. Marks' NPI number?
Dr. Gustavo J. Marks' NPI number is 1740373315. It was assigned on October 2, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Gustavo J. Marks?
Dr. Gustavo J. Marks is a family medicine physician in Canoga Park, California. The primary specialty in the NPI Registry is Family Medicine Physician (taxonomy code 207Q00000X).
Where does Dr. Gustavo J. Marks practice?
Dr. Marks practices at 22030 Sherman Way #318 #318, Canoga Park, CA 91303. Dr. Marks' primary practice is Valley View Medical Clinic in Canoga Park, California.
What is Dr. Gustavo J. Marks' office phone number?
The practice phone on file for Dr. Marks is (818) 999-5900.
What is Dr. Gustavo J. Marks' medical license number?
Dr. Marks' California license number on file is A54483.
Does Dr. Gustavo J. Marks accept Medicare?
Yes. CMS data shows Dr. Marks billed Medicare for 741 services in 2024.
How many Medicare patients does Dr. Gustavo J. Marks see?
CMS counts 100 Medicare patients who saw Dr. Marks in 2024, with an average age of 77.
What services does Dr. Gustavo J. Marks bill to Medicare?
In 2024, Dr. Marks' most billed Medicare services were care management and other visits (99491), office visit, established patient (99214) and office visit, established patient (99213).
Where did Dr. Gustavo J. Marks go to medical school?
Dr. Marks graduated from University of Buenos Aires in 1986.
What drugs does Dr. Gustavo J. Marks prescribe most?
In 2024 Medicare Part D data, Dr. Marks' most prescribed drugs by claims were Atorvastatin Calcium, Levothyroxine Sodium and Alprazolam.
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Has Dr. Gustavo J. Marks received payments from drug or device companies?
CMS Open Payments shows $6,287 in general payments to Dr. Marks from 27 companies from 2016 to 2024. The largest total came from AstraZeneca Pharmaceuticals LP.
How long has Dr. Gustavo J. Marks been practicing?
Dr. Marks graduated from medical school in 1986, 40 years ago.
What insurance does Dr. Gustavo J. Marks accept?
Dr. Marks is in network with 4 carriers, including Blue Cross Blue Shield of Michigan, Blue Cross Blue Shield of Massachusetts and HCSC. Medicare plans come from the most carriers, 4. Check the plan with the practice before a visit.
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