Analgesics, OpioidAnesthesia, GeneralAnesthesia, Intravenous
Dr. Merlin D. Larson, MD
NPI1003872805
- Medicare services, 2018
- 69
- Publications
- 55
- Clinical trials
- 1
- Hospital affiliations
- 1
- State license
- 1
- Practice address
- 505 Parnassus Ave, Box 0296, San Francisco, CA 94143
- Practice phone
- Call (415) 353-2733
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
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Dr. Merlin D. Larson is an anesthesiologist in San Francisco, California
Dr. Larson practices at UCSF Helen Diller Medical Center at Parnassus Heights in San Francisco, California, part of University of California Health.
Dr. Larson's NPI, 1003872805, was assigned on April 21, 2006. Dr. Larson graduated from University of Kansas School of Medicine - Kansas City in 1965. Dr. Larson's California license number on file is C30707.
NPI and contact details
- NPI
- 1003872805NPI Registry (opens in a new tab)
- NPI enumeration date
- April 21, 2006
- NPI status
- Active
- Practice phone
- (415) 353-2733
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Medical school graduation
- 1965
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Affiliation Data
Dr. Merlin D. Larson practices at UCSF Helen Diller Medical Center at Parnassus Heights in San Francisco, California
Dr. Larson's primary practice is UCSF Helen Diller Medical Center at Parnassus Heights, at 505 Parnassus Ave, Box 0296, San Francisco, CA 94143 in San Francisco County. The practice phone is (415) 353-2733.
- UCSF Helen Diller Medical Center at Parnassus Heights505 Parnassus Ave, Box 0296, San Francisco, CA 94143 · San Francisco CountyPhone(415) 353-2733
Source: Dmand AI Affiliation Data
Dr. Merlin D. Larson is affiliated with 1 site of care
Dr. Larson's primary practice is UCSF Helen Diller Medical Center at Parnassus Heights in San Francisco, California, part of University of California Health.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Merlin D. Larson's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Larson practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| UCSF Helen Diller Medical Center at Parnassus Heights | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
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Dr. Merlin D. Larson is one of 6,593 anesthesiologists in California
Anesthesiology is Dr. Larson's primary specialty in the NPI Registry, under taxonomy code 207L00000X. Dr. Larson is board certified in anesthesiology by the American Board of Anesthesiology. Dr. Larson has a license on file in California.
Specialties and state licenses
- Anesthesiology, CaliforniaPrimary
Anesthesiologists near Dr. Larson
Counts of anesthesiologists with a Dmand AI profile, by place and practice. Each opens the list.
6,593anesthesiologists in California399anesthesiologists in San Francisco134anesthesiologists at UCSF Helen Diller Medical Center at Parnassus Heights
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Merlin D. Larson billed Medicare for 69 services in 2018
CMS data shows 69 Medicare services from Dr. Larson across 1 procedure code in 2018. Medicare paid $3,665 for them. Every service was in a facility, such as a hospital, rather than an office.
Medicare services, 201869
Paid by Medicare$3,665
Procedure codes1
Dr. Larson's Medicare services by type, 2017 to 2018
- 2017
- 2018
- Anesthesia
- 2017: 552018: 6925%
Dr. Larson compared with the California median for anesthesiologists, 2018
- Dr. Larson
- California median
- Medicare services
- 69vs 72Close to median
Medians across 5,562 anesthesiologists in California with Dmand AI profiles that report each measure.
Dr. Larson'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.
Need commercial claims for Dr. Larson?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Larson and other anesthesiologists in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Merlin D. Larson's patients have a median age of 56
Across all payers, Dmand AI patient panel data puts Dr. Larson's median patient age at 56, with 25% women.
Dr. Larson's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 56
Patient panel by sex, all payers
- Women25%
- Men75%
Source: Dmand AI Patient Panel Data
For MedTech and pharma teams
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Dr. Merlin D. Larson has 55 publications on record
Dmand AI links 55 papers to Dr. Larson, published from 2007 to 2025. 2021 was the busiest year, with 3. The most frequent topics are Reflex, Pupillary, Pupil and Analgesics, Opioid. Dr. Larson has published most often in Anesthesiology. Dr. Larson's most frequent co-authors are Matthias Behrends, MD, Farzin Tayefeh, MD and Rachel Eshima McKay, MD.
Papers55
Years published2007 to 2025
Dr. Larson's papers by year, 2009 to 2025
Topics Dr. Larson writes about most
- Reflex, Pupillary
- Pupil
- Analgesics, Opioid
- Light
- Anesthesia, General
- Isoflurane
- Anesthetics, Inhalation
- Blood Pressure
Dr. Larson's most frequent co-authors
- Matthias Behrends, MD5 shared papers
- Farzin Tayefeh, MD5 shared papers
- Rachel Eshima McKay, MD4 shared papers
Recent publications by Dr. Larson
Neurocrit Care
Brain InjuriesConsciousness DisordersPersistent Vegetative State
Adrenergic beta-AntagonistsAnalgesics, OpioidLight
Analgesics, OpioidPainPain Management
Acta Neurochir (Wien)
AnisocoriaBrain InjuriesBrimonidine Tartrate
See who Dr. Larson researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Larson works with, so you can find a warm path to the right anesthesiologists.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Merlin D. Larson has worked on 1 clinical trial
Dmand AI links Dr. Larson to 1 clinical trial. Conditions studied include Pain, Postoperative and Postoperative Complications.
Conditions in Dr. Larson's trials
- Pain, Postoperative
- Postoperative Complications
Investigators on the most trials with Dr. Larson
Recent clinical trials with Dr. Larson
Pain, PostoperativePostoperative ComplicationsAnesthesia Premedication, Induction and Maintenance
Sources: Dmand AI Research Linkage; and ClinicalTrials.gov (National Library of Medicine)
Dr. Merlin D. Larson graduated from University of Kansas School of Medicine - Kansas City
Dr. Larson graduated from University of Kansas School of Medicine - Kansas City in 1965.
- Medical school
- Board certified in anesthesiology
Source: Dmand AI Professional Profile Data
Sources for Dr. Merlin D. Larson'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 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 |
| Publications, topics and co-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| Clinical trials and co-investigators | Dmand AI Research LinkageClinicalTrials.gov (National Library of Medicine) (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. Merlin D. Larson
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. Merlin D. Larson's NPI number?
Dr. Merlin D. Larson's NPI number is 1003872805. It was assigned on April 21, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Merlin D. Larson?
Dr. Merlin D. Larson is an anesthesiologist in San Francisco, California. The primary specialty in the NPI Registry is Anesthesiology Physician (taxonomy code 207L00000X).
Where does Dr. Merlin D. Larson practice?
Dr. Larson practices at 505 Parnassus Ave, Box 0296, San Francisco, CA 94143. Dr. Larson's primary practice is UCSF Helen Diller Medical Center at Parnassus Heights in San Francisco, California, part of University of California Health.
What is Dr. Merlin D. Larson's office phone number?
The practice phone on file for Dr. Larson is (415) 353-2733.
What is Dr. Merlin D. Larson's medical license number?
Dr. Larson's California license number on file is C30707.
Which hospitals is Dr. Merlin D. Larson affiliated with?
Dr. Larson practices at UCSF Helen Diller Medical Center at Parnassus Heights in San Francisco, California.
Does Dr. Merlin D. Larson accept Medicare?
Yes. CMS data shows Dr. Larson billed Medicare for 69 services in 2018.
Is Dr. Merlin D. Larson board certified?
Yes. Dr. Larson is board certified in anesthesiology by the American Board of Anesthesiology.
What services does Dr. Merlin D. Larson bill to Medicare?
In 2018, Dr. Larson's most billed Medicare services were anesthesia (01996).
Where did Dr. Merlin D. Larson go to medical school?
Dr. Larson graduated from University of Kansas School of Medicine - Kansas City in 1965.
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How long has Dr. Merlin D. Larson been practicing?
Dr. Larson graduated from medical school in 1965, 61 years ago.
Does Dr. Merlin D. Larson do research?
Dmand AI links 55 publications to Dr. Larson, published from 2007 to 2025. Dr. Larson has worked on 1 clinical trial.
Who does Dr. Merlin D. Larson publish with?
Dr. Larson's most frequent co-authors are Matthias Behrends, MD (5 shared papers), Farzin Tayefeh, MD (5 shared papers) and Rachel Eshima McKay, MD (4 shared papers).
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