Dr. Christopher H. Lemaster, MD
- Medicare services, 2024
- 17
- Medicare patients, 2024
- 26
- Part D claims, 2024
- 73
- Publications
- 7
- Hospital affiliations
- 1
- Practice address
- 380 West MacArthur Boulevard, Oakland, CA 94609
- Practice phone
- Call (510) 251-0121
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Addiction Medicine & Recovery Services at Oakland Medical Center
Outpatient Addiction Treatment · Oakland, California
Find Dr. Lemaster'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. Christopher H. Lemaster is an emergency medicine physician in Oakland, California
Dr. Lemaster practices at Addiction Medicine & Recovery Services at Oakland Medical Center in Oakland, California.
Dr. Lemaster's NPI, 1366563835, was assigned on April 3, 2007. Dr. Lemaster graduated from Keck School of Medicine of USC in 2006. Dr. Lemaster's California license number on file is A111737.
- NPI
- 1366563835NPI Registry (opens in a new tab)
- Medicare PAC ID
- 0042336851
- NPI enumeration date
- April 3, 2007
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (510) 251-0121
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 46
- Medical school graduation
- 2006
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Christopher H. Lemaster practices at Addiction Medicine & Recovery Services at Oakland Medical Center in Oakland, California
Dr. Lemaster's primary practice is Addiction Medicine & Recovery Services at Oakland Medical Center, at 380 West MacArthur Boulevard, Oakland, CA 94609. The practice phone is (510) 251-0121.
- Addiction Medicine & Recovery Services at Oakland Medical Center380 West MacArthur Boulevard, Oakland, CA 94609Phone(510) 251-0121
Source: Dmand AI Affiliation Data
Dr. Christopher H. Lemaster is affiliated with 2 sites of care and 1 medical group
Dr. Lemaster's primary practice is Addiction Medicine & Recovery Services at Oakland Medical Center in Oakland, California. Dr. Lemaster is also affiliated with Oakland Medical Center. The medical group on file is The Permanente Medical Group, Inc.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Christopher H. Lemaster's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Lemaster practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Addiction Medicine & Recovery Services at Oakland Medical Center | Available with a free account |
| +1 more affiliated site | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Christopher H. Lemaster is one of 7,423 emergency medicine physicians in California
Emergency medicine is Dr. Lemaster's primary specialty in the NPI Registry, under taxonomy code 207P00000X. Dr. Lemaster is board certified in emergency medicine by the American Board of Emergency Medicine. Dr. Lemaster has a license on file in California.
Specialties and state licenses
- Emergency medicine, CaliforniaPrimary
Emergency medicine physicians near Dr. Lemaster
Counts of emergency 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. Christopher H. Lemaster billed Medicare for 17 services in 2024
CMS data shows 17 Medicare services from Dr. Lemaster across 1 procedure code in 2024, for 26 Medicare patients. Medicare paid $2,497 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Lemaster's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 342024: 1750%
Dr. Lemaster compared with the California median for emergency medicine physicians, 2024
- Dr. Lemaster
- California median
- Medicare services
- 17vs 26594% below
- Medicare patients
- 26vs 24389% below
- Part D claims
- 13vs 6279% below
Medians across 7,079 emergency medicine physicians in California with Dmand AI profiles that report each measure.
Dr. Lemaster'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.
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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Lemaster and other emergency medicine physicians in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Christopher H. Lemaster treated 26 Medicare patients in 2024, average age 65
CMS counts 26 Medicare patients who saw Dr. Lemaster in 2024. The largest group is 65 to 74, with 11 patients. 65% of them have high blood pressure, and 50% have high cholesterol. Their average risk score is 1.58, 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. Lemaster's median patient age at 45, with 51% women.
Dr. Lemaster's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Lemaster's Medicare patients by sex, 2024
- Women1558%
- Men1142%
Chronic conditions among Dr. Lemaster's Medicare patients, 2024
- High blood pressure65%
- High cholesterol50%
- Arthritis46%
- Alcohol and drug use disorders42%
- Mood disorders42%
Share of Medicare patients with each condition. A patient can have several.
Dr. Lemaster's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 45
Patient panel by sex, all payers
- Women51%
- Men48%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Christopher H. Lemaster wrote 73 Medicare Part D claims in 2024
In 2024, Dr. Lemaster wrote 73 Medicare Part D claims for 54 patients. 95% of them were for generic drugs. CMS names the drug for 13 of them, across 1 drug with 11 or more claims each, at $552 in total drug cost. In 2016, CMS named 11 claims across 1 drug.
Dr. Lemaster's Part D claims by kind of drug, 2024
- Generic69 claims95%
- Brand-name and other4 claims5%
Dr. Lemaster's most prescribed drugs by claims, 2017
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. Lemaster's Part D claims, 2024
- Antibiotics26%19 of 73 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, 2016 to 2017
- 2016
- 2017
- Claims for drugs CMS names
- 2016: 112017: 1318%
Drugs named by CMS: 1 in 2017, 1 in 2016.
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
How Dr. Christopher H. Lemaster takes part in Medicare
Dr. Lemaster 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)
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Dr. Christopher H. Lemaster has 7 publications on record
Dmand AI links 7 papers to Dr. Lemaster, published from 2009 to 2025. The most frequent topics are Emergency Service, Hospital. Dr. Lemaster has published most often in Ann Emerg Med. Dr. Lemaster's most frequent co-authors are Ashish Tulsidas Agrawal, MD, Yusuke F. Kimura, MD and Suzanne C. Lippert, MD.
Dr. Lemaster's papers by year, 2009 to 2025
Topics Dr. Lemaster writes about most
- Emergency Service, Hospital
Dr. Lemaster's most frequent co-authors
- Ashish Tulsidas Agrawal, MD1 shared paper
- Yusuke F. Kimura, MD1 shared paper
- Suzanne C. Lippert, MD1 shared paper
Recent publications by Dr. Lemaster
PLoS One
See who Dr. Lemaster researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Lemaster works with, so you can find a warm path to the right emergency medicine physicians.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Christopher H. Lemaster graduated from Keck School of Medicine of USC
Dr. Lemaster graduated from Keck School of Medicine of USC in 2006.
- Medical school
- Board certified in emergency medicine
- Board certified in clinical informatics
Source: Dmand AI Professional Profile Data
Dr. Christopher H. Lemaster accepts plans from 2 insurance carriers
Dr. Lemaster is in network with 2 carriers, including Kaiser Permanente and CMS Medicare. EPO plans come from the most carriers, 1. Check the plan with the practice before a visit.
- Kaiser Permanente
- CMS Medicare
Plan types Dr. Lemaster accepts, by number of carriers
- EPO1
- HMO1
- Medicare1
- POS1
Source: Dmand AI Insurance Network Data
Sources for Dr. Christopher H. Lemaster'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 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) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (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 |
| 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. Christopher H. Lemaster
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. Christopher H. Lemaster's NPI number?
Dr. Christopher H. Lemaster's NPI number is 1366563835. It was assigned on April 3, 2007, and it is active in the NPI Registry.
What kind of doctor is Dr. Christopher H. Lemaster?
Dr. Christopher H. Lemaster is an emergency medicine physician in Oakland, California. The primary specialty in the NPI Registry is Emergency Medicine Physician (taxonomy code 207P00000X).
Where does Dr. Christopher H. Lemaster practice?
Dr. Lemaster practices at 380 West MacArthur Boulevard, Oakland, CA 94609. Dr. Lemaster's primary practice is Addiction Medicine & Recovery Services at Oakland Medical Center in Oakland, California.
What is Dr. Christopher H. Lemaster's office phone number?
The practice phone on file for Dr. Lemaster is (510) 251-0121.
What is Dr. Christopher H. Lemaster's medical license number?
Dr. Lemaster's California license number on file is A111737.
Which hospitals is Dr. Christopher H. Lemaster affiliated with?
Dr. Lemaster is affiliated with Oakland Medical Center.
What medical group is Dr. Christopher H. Lemaster part of?
Dr. Lemaster is linked to The Permanente Medical Group, Inc.
Does Dr. Christopher H. Lemaster accept Medicare?
Yes. CMS data shows Dr. Lemaster billed Medicare for 17 services in 2024, and Dr. Lemaster accepts Medicare assignment.
How many Medicare patients does Dr. Christopher H. Lemaster see?
CMS counts 26 Medicare patients who saw Dr. Lemaster in 2024, with an average age of 65.
Is Dr. Christopher H. Lemaster board certified?
Yes. Dr. Lemaster is board certified in emergency medicine by the American Board of Emergency Medicine.
Show 7 more questionsShow fewer questions
What services does Dr. Christopher H. Lemaster bill to Medicare?
In 2024, Dr. Lemaster's most billed Medicare services were emergency department visit (99285).
Where did Dr. Christopher H. Lemaster go to medical school?
Dr. Lemaster graduated from Keck School of Medicine of USC in 2006.
What drugs does Dr. Christopher H. Lemaster prescribe most?
In 2017 Medicare Part D data, Dr. Lemaster's most prescribed drugs by claims were Ventolin Hfa.
How long has Dr. Christopher H. Lemaster been practicing?
Dr. Lemaster graduated from medical school in 2006, 20 years ago.
Does Dr. Christopher H. Lemaster do research?
Dmand AI links 7 publications to Dr. Lemaster, published from 2009 to 2025.
Who does Dr. Christopher H. Lemaster publish with?
Dr. Lemaster's most frequent co-authors are Ashish Tulsidas Agrawal, MD (1 shared paper), Yusuke F. Kimura, MD (1 shared paper) and Suzanne C. Lippert, MD (1 shared paper).
What insurance does Dr. Christopher H. Lemaster accept?
Dr. Lemaster is in network with 2 carriers, including Kaiser Permanente and CMS Medicare. EPO plans come from the most carriers, 1. Check the plan with the practice before a visit.
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