Dr. John Maa, MD
- Medicare services, 2018
- 93
- Part D claims, 2021
- 12
- Publications
- 54
- Hospital affiliations
- 1
- Industry payments
- $63
- Practice address
- 845 Jackson St, San Francisco, CA 94133
- Practice phone
- Call (415) 982-2400
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Maa'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. John Maa is a general surgeon in San Francisco, California
Dr. Maa practices at Chinese Hospital in San Francisco, California, part of Chinese Hospital.
Dr. Maa's NPI, 1356305866, was assigned on April 12, 2006. Dr. Maa graduated from Harvard Medical School in 1994. Dr. Maa's California license number on file is A55909.
- NPI
- 1356305866NPI Registry (opens in a new tab)
- Medicare PAC ID
- 1850475963
- NPI enumeration date
- April 12, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (415) 982-2400
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 58
- Medical school graduation
- 1994
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. John Maa practices at Chinese Hospital in San Francisco, California
Dr. Maa's primary practice is Chinese Hospital, at 845 Jackson St, San Francisco, CA 94133 in San Francisco County. The practice phone is (415) 982-2400.
- Chinese Hospital845 Jackson St, San Francisco, CA 94133 · San Francisco CountyPhone(415) 982-2400
Source: Dmand AI Affiliation Data
Dr. John Maa is affiliated with 1 site of care and 2 medical groups
Dr. Maa's primary practice is Chinese Hospital in San Francisco, California, part of Chinese Hospital. The medical group on file is Chinese Hospital. Dmand AI also links Dr. Maa to 1 more medical group, named with a free account. Dr. Maa's employer is on file too: a hospital.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. John Maa's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Maa practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Chinese Hospital | Available with a free account |
| +1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
Dmand AI maps EHR vendors, IT decision makers and buying committees across Chinese Hospital and 6.2K+ hospitals, with verified contacts in the same login.
Dr. John Maa is one of 2,926 general surgeons in California
Surgery is Dr. Maa's primary specialty in the NPI Registry, under taxonomy code 208600000X. Dr. Maa is board certified in surgery by the American Board of Surgery. Dr. Maa has a license on file in California.
Specialties and state licenses
- Surgery, CaliforniaPrimary
Clinical focus
Dmand AI lists abdominal adhesion surgery, chest trauma, collapsed lung, gallbladder removal, groin hernia surgery, multiple traumatic injuries, non-surgical back problems and traumatic coma among the conditions Dr. Maa treats.
General surgeons near Dr. Maa
Counts of general surgeons 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. John Maa billed Medicare for 93 services in 2018
CMS data shows 93 Medicare services from Dr. Maa across 2 procedure codes in 2018. Medicare paid $4,252 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Maa's Medicare services by type, 2017 to 2018
- 2017
- 2018
- Office and hospital visits
- 2017: 1572018: 9341%
Dr. Maa compared with the California median for general surgeons, 2018
- Dr. Maa
- California median
- Medicare services
- 93vs 16644% below
- Part D claims
- 12vs 3465% below
Medians across 2,606 general surgeons in California with Dmand AI profiles that report each measure.
Dr. Maa'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. Maa?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Maa and other general surgeons in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. John Maa's patients have a median age of 66
Across all payers, Dmand AI patient panel data puts Dr. Maa's median patient age at 66, with 27% women.
Dr. Maa's 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
- Women27%
- Men53%
Source: Dmand AI Patient Panel Data
Dr. John Maa wrote 12 Medicare Part D claims in 2021
In 2021, Dr. Maa wrote 12 Medicare Part D claims. They cover 1 drug, with $147 in total drug cost.
Dr. Maa's most prescribed drugs by claims, 2021
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Source: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026
How Dr. John Maa takes part in Medicare
Dr. Maa 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. John Maa has 54 publications on record
Dmand AI links 54 papers to Dr. Maa, published from 2007 to 2023. 2013 was the busiest year, with 3. The most frequent topics are General Surgery, California and Postoperative Complications. Dr. Maa has published most often in Bull Am Coll Surg. Dr. Maa's most frequent co-authors are Jessica E. Gosnell, MD, Jonathan Todd Carter, MD and Hobart W. Harris, MD.
Dr. Maa's papers by year, 2009 to 2023
Topics Dr. Maa writes about most
- General Surgery
- California
- Postoperative Complications
- Smoking
- Smoking Cessation
- Societies, Medical
- Surgical Procedures, Operative
- Patient Education as Topic
Dr. Maa's most frequent co-authors
- Jessica E. Gosnell, MD7 shared papers
- Jonathan Todd Carter, MD6 shared papers
- Hobart W. Harris, MD5 shared papers
Recent publications by Dr. Maa
See who Dr. Maa researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Maa works with, so you can find a warm path to the right general surgeons.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. John Maa received $63 in industry payments in 2018
CMS Open Payments shows 1 general payment to Dr. Maa from 1 drug or device company in 2018. Food and beverage make up the largest share, 100% of the total. Janssen Pharmaceuticals, Inc paid the most, $63.
Companies that paid Dr. Maa the most, 2018 to 2018
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. John Maa has 3 awards and honors on record
Dmand AI lists 3 awards for Dr. Maa, most recently Ellenberger Award Recipient for Excellence in State Advocacy in 2013.
Awards and honors for Dr. Maa
- 2013
- Ellenberger Award Recipient for Excellence in State Advocacy
- Undated
- ACS Fellow
- Super Doc
Source: Dmand AI Professional Profile Data
Dr. John Maa graduated from Harvard Medical School
Dr. Maa graduated from Harvard Medical School in 1994. Dr. Maa is a member of ACS, American Heart Association and CMA.
- Medical school
- Board certified in surgery
Source: Dmand AI Professional Profile Data
Dr. John Maa accepts plans from 5 insurance carriers
Dr. Maa is in network with 5 carriers, including Blue Cross Blue Shield of Michigan, Elevance and Blue Cross Blue Shield of Massachusetts. Medicare plans come from the most carriers, 5. Check the plan with the practice before a visit.
- Blue Cross Blue Shield of Michigan
- Elevance
- Blue Cross Blue Shield of Massachusetts
- HCSC
- Regence Health Plans
Plan types Dr. Maa accepts, by number of carriers
- Medicare5
- PPO5
- HMO2
- POS1
Source: Dmand AI Insurance Network Data
Sources for Dr. John Maa'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 |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (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 |
| 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. John Maa
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 Maa's NPI number?
Dr. John Maa's NPI number is 1356305866. It was assigned on April 12, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. John Maa?
Dr. John Maa is a general surgeon in San Francisco, California. The primary specialty in the NPI Registry is Surgery Physician (taxonomy code 208600000X).
Where does Dr. John Maa practice?
Dr. Maa practices at 845 Jackson St, San Francisco, CA 94133. Dr. Maa's primary practice is Chinese Hospital in San Francisco, California, part of Chinese Hospital. Dmand AI also links Dr. Maa to 1 medical group, and a free account names each one.
What is Dr. John Maa's office phone number?
The practice phone on file for Dr. Maa is (415) 982-2400. Dmand AI also checks direct phone and mobile numbers, available with a free account.
What is Dr. John Maa's email address?
Dmand AI checks professional and personal email addresses for Dr. Maa through healthcare-specific waterfall enrichment. They are available with a free Dmand AI account.
What is Dr. John Maa's medical license number?
Dr. Maa's California license number on file is A55909.
Which hospitals is Dr. John Maa affiliated with?
Dr. Maa practices at Chinese Hospital in San Francisco, California.
What medical group is Dr. John Maa part of?
Dr. Maa is linked to Chinese Hospital. Dmand AI links Dr. Maa to 1 more medical group, named with a free account.
Who employs Dr. John Maa?
Dmand AI has Dr. Maa's employer on file: a hospital. The organization's name is available with a free Dmand AI account.
Who does Dr. John Maa practice with?
Dmand AI links 33 HCPs to Dr. Maa's primary medical group, 2 of them general surgeons. A free account lists them, with verified contacts.
Show 11 more questionsShow fewer questions
Does Dr. John Maa accept Medicare?
Yes. CMS data shows Dr. Maa billed Medicare for 93 services in 2018, and Dr. Maa accepts Medicare assignment.
Is Dr. John Maa board certified?
Yes. Dr. Maa is board certified in surgery by the American Board of Surgery.
What services does Dr. John Maa bill to Medicare?
In 2018, Dr. Maa's most billed Medicare services were hospital inpatient care (99231) and hospital inpatient care (99221).
Where did Dr. John Maa go to medical school?
Dr. Maa graduated from Harvard Medical School in 1994.
What drugs does Dr. John Maa prescribe most?
In 2021 Medicare Part D data, Dr. Maa's most prescribed drugs by claims were Hydrocodone-Acetaminophen.
Has Dr. John Maa received payments from drug or device companies?
CMS Open Payments shows $63 in general payments to Dr. Maa from 1 company from 2018 to 2018. The largest total came from Janssen Pharmaceuticals, Inc.
How long has Dr. John Maa been practicing?
Dr. Maa graduated from medical school in 1994, 32 years ago.
Does Dr. John Maa do research?
Dmand AI links 54 publications to Dr. Maa, published from 2007 to 2023.
Who does Dr. John Maa publish with?
Dr. Maa's most frequent co-authors are Jessica E. Gosnell, MD (7 shared papers), Jonathan Todd Carter, MD (6 shared papers) and Hobart W. Harris, MD (5 shared papers).
What EHR does Dr. John Maa's practice use?
Dmand AI tracks the EHR system at Chinese Hospital and at 1 medical group. The vendor and product are available with a free Dmand AI account.
What insurance does Dr. John Maa accept?
Dr. Maa is in network with 5 carriers, including Blue Cross Blue Shield of Michigan, Elevance and Blue Cross Blue Shield of Massachusetts. Medicare plans come from the most carriers, 5. Check the plan with the practice before a visit.
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