Dr. David Loren Marcus, MD
- Medicare services, 2017
- 146
- Part D claims, 2020
- 14
- Publications
- 18
- Industry payments
- $6,115
- State license
- 1
- Practice address
- CA
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Find Dr. Marcus' 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. David Loren Marcus is a psychiatrist in California
Dr. Marcus practices in California.
Dr. Marcus' NPI, 1437287208, was assigned on March 1, 2007. Dr. Marcus graduated from University of Kansas School of Medicine - Kansas City in 1995. Dr. Marcus' California license number on file is A78153.
- NPI
- 1437287208NPI Registry (opens in a new tab)
- NPI enumeration date
- March 1, 2007
- NPI status
- Active
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Medical school graduation
- 1995
Sources: NPPES NPI Registry (CMS); and Dmand AI Professional Profile Data
Dmand AI tracks the EHR system at Dr. David Loren Marcus' practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Marcus practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Dr. Marcus' practice | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. David Loren Marcus is one of 6,803 psychiatrists in California
Psychiatry is Dr. Marcus' primary specialty in the NPI Registry, under taxonomy code 2084P0800X. Dr. Marcus has a license on file in California.
Specialties and state licenses
- Psychiatry, CaliforniaPrimary
Psychiatrists near Dr. Marcus
Counts of psychiatrists 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. David Loren Marcus billed Medicare for 146 services in 2017
CMS data shows 146 Medicare services from Dr. Marcus across 2 procedure codes in 2017. Medicare paid $6,489 for them. Every service was in an office.
Dr. Marcus' Medicare services by type, 2016 to 2017
- 2016
- 2017
- Tests and treatments
- 2016: 1132017: 7335%
- Office and hospital visits
- 2016: 1132017: 7335%
Dr. Marcus compared with the California median for psychiatrists, 2017
- Dr. Marcus
- California median
- Medicare services
- 146vs 11923% above
- Part D claims
- 14vs 14490% below
Medians across 6,809 psychiatrists in California with Dmand AI profiles that report each measure.
Dr. Marcus' most billed Medicare procedure codes, 2017
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. Marcus?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Marcus and other psychiatrists in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. David Loren Marcus wrote 14 Medicare Part D claims in 2020
In 2020, Dr. Marcus wrote 14 Medicare Part D claims. Every claim was for a generic drug. They cover 1 drug, with $261 in total drug cost. In 2019, CMS named 260 claims across 12 drugs.
Dr. Marcus' most prescribed drugs by claims, 2020
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, 2019 to 2020
- 2019
- 2020
- Claims for drugs CMS names
- 2019: 2602020: 1495%
Drugs named by CMS: 1 in 2020, 12 in 2019.
Source: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026
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Dr. David Loren Marcus has 18 publications on record
Dmand AI links 18 papers to Dr. Marcus, published from 2005 to 2021. The most frequent topics are Alzheimer Disease, Anemia, Hypochromic and 5-Aminolevulinate Synthetase. Dr. Marcus has published most often in Am J Med Sci. Dr. Marcus' most frequent co-authors are Joanne G. Crantz, MD, Charles L. Rodriguez, MD and Nancy Ann Shadick, MD.
Topics Dr. Marcus writes about most
- Alzheimer Disease
- Anemia, Hypochromic
- 5-Aminolevulinate Synthetase
- Anemia
- Blood Coagulation Factors
- Cytochrome P-450 Enzyme System
- Drug Interactions
- Heme
Dr. Marcus' most frequent co-authors
- Joanne G. Crantz, MD1 shared paper
- Charles L. Rodriguez, MD1 shared paper
- Nancy Ann Shadick, MD1 shared paper
Recent publications by Dr. Marcus
Med Sci Monit
Am J Med Sci
J Am Geriatr Soc
See who Dr. Marcus researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Marcus works with, so you can find a warm path to the right psychiatrists.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. David Loren Marcus received $6,115 in industry payments from 2016 to 2020
CMS Open Payments shows 189 general payments to Dr. Marcus from 15 drug and device companies from 2016 to 2020. Food and beverage make up the largest share, 57% of the total. Covidien LP paid the most, $2,608.
General payments to Dr. Marcus by program year, 2016 to 2020
General payments to Dr. Marcus by kind, 2016 to 2020
- Food and beverage$3,48457%
- Speaker and faculty fees$2,10034%
- Travel and lodging$5088%
- Education$230%
Companies that paid Dr. Marcus the most, 2016 to 2020
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. David Loren Marcus graduated from University of Kansas School of Medicine - Kansas City
Dr. Marcus graduated from University of Kansas School of Medicine - Kansas City in 1995.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. David Loren Marcus'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 |
| 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 |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab) |
| Publications, topics and co-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile 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. David Loren Marcus
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. David Loren Marcus' NPI number?
Dr. David Loren Marcus' NPI number is 1437287208. It was assigned on March 1, 2007, and it is active in the NPI Registry.
What kind of doctor is Dr. David Loren Marcus?
Dr. David Loren Marcus is a psychiatrist in California. The primary specialty in the NPI Registry is Psychiatry Physician (taxonomy code 2084P0800X).
What is Dr. David Loren Marcus' medical license number?
Dr. Marcus' California license number on file is A78153.
Does Dr. David Loren Marcus accept Medicare?
Yes. CMS data shows Dr. Marcus billed Medicare for 146 services in 2017.
What services does Dr. David Loren Marcus bill to Medicare?
In 2017, Dr. Marcus' most billed Medicare services were psychiatric service (90833) and office visit, established patient (99213).
Where did Dr. David Loren Marcus go to medical school?
Dr. Marcus graduated from University of Kansas School of Medicine - Kansas City in 1995.
What drugs does Dr. David Loren Marcus prescribe most?
In 2020 Medicare Part D data, Dr. Marcus' most prescribed drugs by claims were Quetiapine Fumarate.
Has Dr. David Loren Marcus received payments from drug or device companies?
CMS Open Payments shows $6,115 in general payments to Dr. Marcus from 15 companies from 2016 to 2020. The largest total came from Covidien LP.
How long has Dr. David Loren Marcus been practicing?
Dr. Marcus graduated from medical school in 1995, 31 years ago.
Does Dr. David Loren Marcus do research?
Dmand AI links 18 publications to Dr. Marcus, published from 2005 to 2021.
Who does Dr. David Loren Marcus publish with?
Dr. Marcus' most frequent co-authors are Joanne G. Crantz, MD (1 shared paper), Charles L. Rodriguez, MD (1 shared paper) and Nancy Ann Shadick, MD (1 shared paper).
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