Dr. John R. Chamberlain, MD

  • San Francisco, CA
  • Forensic psychiatry physician
NPI1114036480PAC ID0749364818
Medicare services, 2024
614
Medicare patients, 2024
165
Part D claims, 2024
98
Publications
4
MIPS score, 2024
85
Practice address
505 Parnassus Ave, Box 0296, San Francisco, CA 94143
Practice phone
Call (415) 353-2733
Professional email
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Personal email
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Mobile number
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Social profiles

Primary practice

UCSF Helen Diller Medical Center at Parnassus Heights

Hospital · San Francisco, California

See all 8 affiliations

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Dr. John R. Chamberlain is a forensic psychiatry physician in San Francisco, California

Dr. Chamberlain practices at UCSF Helen Diller Medical Center at Parnassus Heights in San Francisco, California, part of University of California Health.

Dr. Chamberlain's NPI, 1114036480, was assigned on August 30, 2006. Dr. Chamberlain graduated from UC San Diego School of Medicine in 1995. Dr. Chamberlain holds California license A065086.

NPI and contact details
Medicare PAC ID
0749364818
NPI enumeration date
August 30, 2006
NPI status
Active
Accepts Medicare assignment
Yes
Offers telehealth
Yes
Practice phone
(415) 353-2733
Professional email
Get email
Personal email
Get email
Mobile number
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Sex
Male
Estimated age
57
Medical school graduation
1995

Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)

Dr. John R. Chamberlain practices at UCSF Helen Diller Medical Center at Parnassus Heights in San Francisco, California

Dr. Chamberlain'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.

Source: Dmand AI Affiliation Data

Dr. John R. Chamberlain is affiliated with 4 sites of care and 4 medical groups

Dr. Chamberlain's primary practice is UCSF Helen Diller Medical Center at Parnassus Heights in San Francisco, California, part of University of California Health. The medical group on file is UCSF Pediatrics. Dmand AI also links Dr. Chamberlain to 3 more group practices and clinics and 3 medical groups, each named with a free account.

See all 8 affiliations for Dr. Chamberlain

Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data

Dmand AI tracks the EHR system at Dr. John R. Chamberlain's practice

Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Chamberlain practices, 4 sites in all. Vendor and product names are available with a free account.

EHR by site
SiteEHR vendor and product
UCSF Helen Diller Medical Center at Parnassus HeightsAvailable with a free account
+3 more sites and 3 medical groupsAvailable with a free account

Source: Dmand AI Technology Install Data

For health IT teams

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Dr. John R. Chamberlain is one of 62 forensic psychiatry physicians in California

Forensic psychiatry is Dr. Chamberlain's primary specialty in the NPI Registry, under taxonomy code 2084F0202X. Dr. Chamberlain is board certified in forensic psychiatry by the American Board of Psychiatry and Neurology. Dr. Chamberlain is licensed in California.

Specialties and state licenses

  • Forensic psychiatry, CaliforniaPrimaryLicense A065086 · 1998 to 2027 · taxonomy 2084F0202X

Clinical focus

Dmand AI lists ADHD, adjustment disease, alcohol use disorders, anxiety, bipolar disorder, depression, drug use disorders and insomnia among the conditions Dr. Chamberlain treats.

Forensic psychiatry physicians near Dr. Chamberlain

Counts of forensic psychiatry physicians with a Dmand AI profile, by place and practice. Each opens the list.

62forensic psychiatry physicians in California
6forensic psychiatry physicians in San Francisco

Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks

Dr. John R. Chamberlain billed Medicare for 614 services in 2024

CMS data shows 614 Medicare services from Dr. Chamberlain across 2 procedure codes in 2024, for 165 Medicare patients. Medicare paid $46,991 for them. Every service was in a facility, such as a hospital, rather than an office.

Medicare services, 2024614
Medicare patients165
Paid by Medicare$46,991
Procedure codes2

Dr. Chamberlain's Medicare services by type, 2023 to 2024

  • 2023
  • 2024
Office and hospital visits
2023: 7442024: 50732%
Tests and treatments
2023: 1372024: 10722%

Dr. Chamberlain compared with the California median for forensic psychiatry physicians, 2024

  • Dr. Chamberlain
  • California median
Medicare services
614vs 976.3 times
Medicare patients
165vs 325.2 times
Part D claims
27vs 7263% below

Medians across 56 forensic psychiatry physicians in California with Dmand AI profiles that report each measure.

Dr. Chamberlain's 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.

See all procedures by Dr. Chamberlain

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Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks

Dr. John R. Chamberlain treated 165 Medicare patients in 2024, average age 67

CMS counts 165 Medicare patients who saw Dr. Chamberlain in 2024. The largest group is 65 to 74, with 61 patients. 75% of them have anxiety, and 75% have depression. 44% are also on Medicaid. Their average risk score is 1.88, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.

Across all payers, Dmand AI patient panel data puts Dr. Chamberlain's median patient age at 63, with 61% women.

Medicare patients, 2024165
Average age67
Average risk score1.88
Also on Medicaid44%

Dr. Chamberlain's Medicare patients by age, 2024

CMS leaves out age groups with fewer than 11 patients.

Dr. Chamberlain's Medicare patients by sex, 2024

  • Women10362%
  • Men6238%

Chronic conditions among Dr. Chamberlain's Medicare patients, 2024

  1. Anxiety75%
  2. Depression75%
  3. Mood disorders75%
  4. High blood pressure63%
  5. High cholesterol61%
  6. Arthritis47%
  7. Chronic kidney disease30%
  8. Bipolar disorder25%

Share of Medicare patients with each condition. A patient can have several.

Dr. Chamberlain's patients across all payers

Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.

Patient panel by age, all payers

Median age 63

Patient panel by sex, all payers

  • Women61%
  • Men34%

Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data

Dr. John R. Chamberlain wrote 98 Medicare Part D claims in 2024

In 2024, Dr. Chamberlain wrote 98 Medicare Part D claims for 31 patients. 98% of them were for generic drugs. CMS names the drug for 27 of them, across 2 drugs with 11 or more claims each, at $174 in total drug cost. In 2023, CMS named 30 claims across 2 drugs.

Part D claims, 202498
Drugs named by CMS2
Total drug cost$174
Part D patients31

Dr. Chamberlain's Part D claims by kind of drug, 2024

  • Generic96 claims98%
  • Brand-name and other2 claims2%

Dr. Chamberlain's 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.

Part D claims for drugs CMS names, 2023 to 2024

  • 2023
  • 2024
Claims for drugs CMS names
2023: 302024: 2710%

Drugs named by CMS: 2 in 2024, 2 in 2023.

See all prescribing by Dr. Chamberlain

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

Dr. John R. Chamberlain scored 85 out of 100 in Medicare's MIPS program for 2024

CMS publishes a Merit-based Incentive Payment System (MIPS) score of 85 out of 100 for Dr. Chamberlain for performance year 2024, reported as part of a group. Dr. Chamberlain accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Chamberlain as offering telehealth.

Accepts Medicare assignment
Yes
Offers telehealth
Yes

Dr. Chamberlain's MIPS scores, performance year 2024

  • 85of 100Final score
  • 81.1of 100Quality
  • 40of 100Improvement Activities
  • 71of 100Cost

Each score is out of 100. The final score weighs the categories CMS scored for this clinician.

Sources: Doctors and Clinicians National Downloadable File (CMS); and Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026

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Dr. John R. Chamberlain has 4 publications on record

Dmand AI links 4 papers to Dr. Chamberlain in 2017. Dr. Chamberlain has published most often in J Am Acad Psychiatry Law. Dr. Chamberlain's most frequent co-authors are James Alden Armontrout, MD, Vivek Datta, MD, MPH and Stephen E. Hall, MD.

Papers4

Dr. Chamberlain's most frequent co-authors

Recent publications by Dr. Chamberlain

See all 4 publications and co-authors

See who Dr. Chamberlain researches with

Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Chamberlain works with, so you can find a warm path to the right forensic psychiatry physicians.

How network discovery works

Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage

Dr. John R. Chamberlain graduated from UC San Diego School of Medicine

Dr. Chamberlain graduated from UC San Diego School of Medicine in 1995.

  1. Medical schoolUC San Diego School of Medicine
  2. Board certified in forensic psychiatryAmerican Board of Psychiatry and Neurology
  3. Board certified in psychiatryAmerican Board of Psychiatry and Neurology

Source: Dmand AI Professional Profile Data

Dr. John R. Chamberlain accepts plans from 8 insurance carriers

Dr. Chamberlain is in network with 8 carriers, including Aetna, Blue Cross Blue Shield of Michigan and Blue Cross Blue Shield of Massachusetts. Medicare plans come from the most carriers, 7. Check the plan with the practice before a visit.

  • Aetna
  • Blue Cross Blue Shield of Michigan
  • Blue Cross Blue Shield of Massachusetts
  • HCSC
  • Regence Health Plans
  • CMS Medicare
  • Elevance
  • United Healthcare

Plan types Dr. Chamberlain accepts, by number of carriers

  1. Medicare7
  2. PPO5
  3. HMO3
  4. POS2
  5. EPO1

Source: Dmand AI Insurance Network Data

Sources for Dr. John R. Chamberlain's profile data

Sources for the data on this page
Data on this pageSource
NPI, name, sex, specialty and licensesNPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data
Practice locations and phoneDmand AI Affiliation Data
Primary practice, affiliations and health systemDmand AI Affiliation DataDmand AI Org Hierarchy Data
Medicare services and procedure codesMedicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab)
State medians for the same specialtyDmand AI Peer Benchmarks
Medicare patients and the all-payer patient panelDmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab)
Part D prescribingMedicare 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)
MIPS scores, telehealth, assignment and procedure percentilesDoctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Clinician Public Reporting: Overall MIPS Performance (CMS) (opens in a new tab)
Publications, topics and co-authorsPubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage
Training, board certification and membershipsDmand AI Professional Profile Data
Insurance carriers and plan typesDmand AI Insurance Network Data
EHR at each practice siteDmand AI Technology Install Data
Similar physiciansDmand AI Affiliation Data

Data last refreshed October 2026Report an inaccuracyRemove my information

FAQ

Frequently asked questions about Dr. John R. Chamberlain

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 R. Chamberlain's NPI number?

Dr. John R. Chamberlain's NPI number is 1114036480. It was assigned on August 30, 2006, and it is active in the NPI Registry.

What kind of doctor is Dr. John R. Chamberlain?

Dr. John R. Chamberlain is a forensic psychiatry physician in San Francisco, California. The primary specialty in the NPI Registry is Forensic Psychiatry Physician (taxonomy code 2084F0202X).

Where does Dr. John R. Chamberlain practice?

Dr. Chamberlain practices at 505 Parnassus Ave, Box 0296, San Francisco, CA 94143. Dr. Chamberlain's primary practice is UCSF Helen Diller Medical Center at Parnassus Heights in San Francisco, California, part of University of California Health. Dmand AI also links Dr. Chamberlain to 3 group practices and clinics and 3 medical groups.

What is Dr. John R. Chamberlain's office phone number?

The practice phone on file for Dr. Chamberlain is (415) 353-2733.

What is Dr. John R. Chamberlain's medical license number?

Dr. Chamberlain holds California license A065086.

Which hospitals is Dr. John R. Chamberlain affiliated with?

Dr. Chamberlain practices at UCSF Helen Diller Medical Center at Parnassus Heights in San Francisco, California.

What medical group is Dr. John R. Chamberlain part of?

Dr. Chamberlain is linked to UCSF Pediatrics. Dmand AI links Dr. Chamberlain to 3 more medical groups.

Does Dr. John R. Chamberlain accept Medicare?

Yes. CMS data shows Dr. Chamberlain billed Medicare for 614 services in 2024, and Dr. Chamberlain accepts Medicare assignment.

Does Dr. John R. Chamberlain offer telehealth?

Yes. The CMS Doctors and Clinicians file lists Dr. Chamberlain as offering telehealth services.

What is Dr. John R. Chamberlain's MIPS score?

Dr. Chamberlain's MIPS final score for performance year 2024 is 85 out of 100, reported as part of a group.

Show 9 more questionsShow fewer questions

How many Medicare patients does Dr. John R. Chamberlain see?

CMS counts 165 Medicare patients who saw Dr. Chamberlain in 2024, with an average age of 67.

Is Dr. John R. Chamberlain board certified?

Yes. Dr. Chamberlain is board certified in forensic psychiatry by the American Board of Psychiatry and Neurology.

What services does Dr. John R. Chamberlain bill to Medicare?

In 2024, Dr. Chamberlain's most billed Medicare services were office visit, established patient (99214) and psychiatric service (90833).

Where did Dr. John R. Chamberlain go to medical school?

Dr. Chamberlain graduated from UC San Diego School of Medicine in 1995.

What drugs does Dr. John R. Chamberlain prescribe most?

In 2024 Medicare Part D data, Dr. Chamberlain's most prescribed drugs by claims were Mirtazapine and Diazepam.

How long has Dr. John R. Chamberlain been practicing?

Dr. Chamberlain graduated from medical school in 1995, 31 years ago.

Does Dr. John R. Chamberlain do research?

Dmand AI links 4 publications to Dr. Chamberlain.

Who does Dr. John R. Chamberlain publish with?

Dr. Chamberlain's most frequent co-authors are James Alden Armontrout, MD (1 shared paper), Vivek Datta, MD, MPH (1 shared paper) and Stephen E. Hall, MD (1 shared paper).

What insurance does Dr. John R. Chamberlain accept?

Dr. Chamberlain is in network with 8 carriers, including Aetna, Blue Cross Blue Shield of Michigan and Blue Cross Blue Shield of Massachusetts. Medicare plans come from the most carriers, 7. Check the plan with the practice before a visit.

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