Clin Dev Immunol
ArthritisDermatomyositisPityriasis Rubra Pilaris
Happy Chan
NPI1740409218
- Medicare services, 2017
- 48
- Part D claims, 2017
- 202
- Publications
- 3
- Insurance carriers
- 3
- State license
- 1
- Practice address
- 2315 Stockton Blvd, Sacramento, CA 95817
- Practice phone
- Call (530) 752-2884
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Find Happy Chan's professional email, personal email and mobile number
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Happy Chan is a rheumatologist in Sacramento, California
Happy Chan practices in Sacramento, California.
Happy Chan's NPI, 1740409218, was assigned on April 24, 2007. Happy Chan graduated from Arizona College of Osteopathic Medicine - Glendale in 2001. Happy Chan holds California license 20A8277.
NPI and contact details
- NPI
- 1740409218NPI Registry (opens in a new tab)
- NPI enumeration date
- April 24, 2007
- NPI status
- Active
- Practice phone
- (530) 752-2884
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
- Medical school graduation
- 2001
Sources: NPPES NPI Registry (CMS); and Dmand AI Professional Profile Data
Happy Chan's practice address is in Sacramento, California
Happy Chan's practice address in the NPI Registry is 2315 Stockton Blvd, Sacramento, CA 95817, in Sacramento County. The practice phone is (530) 752-2884.
- NPI Registry address2315 Stockton Blvd, Sacramento, CA 95817 · Sacramento CountyPhone(530) 752-2884
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dmand AI tracks the EHR system at Happy Chan's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Happy Chan practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Happy Chan's practice | Available with a free account |
Source: Dmand AI Technology Install Data
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Happy Chan is one of 821 rheumatologists in California
Rheumatology is Happy Chan's primary specialty in the NPI Registry, under taxonomy code 207RR0500X. Happy Chan is board certified in internal medicine by the American Board of Internal Medicine. Happy Chan is licensed in California.
Specialties and state licenses
- Rheumatology, CaliforniaPrimary
Rheumatologists near Happy Chan
Counts of rheumatologists 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
Happy Chan billed Medicare for 48 services in 2017
CMS data shows 48 Medicare services from Happy Chan across 2 procedure codes in 2017, all of them office visits. Medicare paid $871 for them. Every service was in an office.
Medicare services, 201748
Paid by Medicare$871
Procedure codes2
Happy Chan's Medicare services by type, 2016 to 2017
- 2016
- 2017
- Office and hospital visits
- 2016: 4772017: 4890%
- Drugs given in the office
- 2016: 472017: 0100%
- Tests and treatments
- 2016: 442017: 0100%
- Other services
- 2016: 182017: 0100%
Happy Chan compared with the California median for rheumatologists, 2017
- Happy Chan
- California median
- Medicare services
- 48vs 90095% below
- Part D claims
- 202vs 96279% below
Medians across 773 rheumatologists in California with Dmand AI profiles that report each measure.
Happy Chan's 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.
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Medicare shows one payer. Book a meeting to get commercial claims data for Happy Chan and other rheumatologists in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Happy Chan's patients have a median age of 73
Across all payers, Dmand AI patient panel data puts Happy Chan's median patient age at 73, with 100% women.
Happy Chan's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 73
Patient panel by sex, all payers
- Women100%
- Men0%
Source: Dmand AI Patient Panel Data
Happy Chan wrote 202 Medicare Part D claims in 2017
In 2017, Happy Chan wrote 202 Medicare Part D claims. They cover 8 drugs, with $348,980 in total drug cost. In 2016, CMS named 583 claims across 14 drugs.
Part D claims, 2017202
Drugs named by CMS8
Total drug cost$348,980
Happy Chan'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.
Part D claims for drugs CMS names, 2016 to 2017
- 2016
- 2017
- Claims for drugs CMS names
- 2016: 5832017: 20265%
Drugs named by CMS: 8 in 2017, 14 in 2016.
Source: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026
For MedTech and pharma teams
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Happy Chan has 3 publications on record
Dmand AI links 3 papers to Happy Chan. Happy Chan's most frequent co-authors are Mitchell H. Grayson, MD, Thorvardur R. Halfdanarson, MD and Stanley Masaji Naguwa, MD.
Papers3
Happy Chan's most frequent co-authors
- Mitchell H. Grayson, MD1 shared paper
- Thorvardur R. Halfdanarson, MD1 shared paper
- Stanley Masaji Naguwa, MD1 shared paper
Recent publications by Happy Chan
Antibodies, AnticardiolipinAnticoagulantsAntiphospholipid Syndrome
AsthmaCathepsin CInflammation
See who Happy Chan researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Happy Chan works with, so you can find a warm path to the right rheumatologists.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Happy Chan has 2 awards and honors on record
Dmand AI lists 2 awards for Happy Chan, most recently CMS Stage 1 EHR in 2012.
Awards and honors for Happy Chan
- 2012
- CMS Stage 1 EHR
- Undated
- ACR Fellow
Source: Dmand AI Professional Profile Data
Happy Chan graduated from Arizona College of Osteopathic Medicine - Glendale
Happy Chan graduated from Arizona College of Osteopathic Medicine - Glendale in 2001.
- Medical school
- Board certified in internal medicine
- Board certified in rheumatology
- Board certified in 2002 - 2027
- Board certified in 2017 - 2025
Source: Dmand AI Professional Profile Data
Happy Chan accepts plans from 3 insurance carriers
Happy Chan is in network with 3 carriers, including Blue Cross Blue Shield of Massachusetts, Blue Cross Blue Shield of Michigan and HCSC. Medicare plans come from the most carriers, 3. Check the plan with the practice before a visit.
- Blue Cross Blue Shield of Massachusetts
- Blue Cross Blue Shield of Michigan
- HCSC
Plan types Happy Chan accepts, by number of carriers
- Medicare3
- PPO3
Source: Dmand AI Insurance Network Data
Sources for Happy Chan'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 | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice 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) |
| Publications, topics and co-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| 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 Happy Chan
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Happy Chan's NPI number?
Happy Chan's NPI number is 1740409218. It was assigned on April 24, 2007, and it is active in the NPI Registry.
What does Happy Chan specialize in?
Happy Chan is a rheumatologist in Sacramento, California. The primary specialty in the NPI Registry is Rheumatology Physician (taxonomy code 207RR0500X).
Where does Happy Chan practice?
Happy Chan practices at 2315 Stockton Blvd, Sacramento, CA 95817.
What is Happy Chan's office phone number?
The practice phone on file for Happy Chan is (530) 752-2884.
What is Happy Chan's medical license number?
Happy Chan holds California license 20A8277.
Does Happy Chan accept Medicare?
Yes. CMS data shows Happy Chan billed Medicare for 48 services in 2017.
Is Happy Chan board certified?
Yes. Happy Chan is board certified in internal medicine by the American Board of Internal Medicine.
What services does Happy Chan bill to Medicare?
In 2017, Happy Chan's most billed Medicare services were office visit, established patient (99214) and office visit, established patient (99213).
Where did Happy Chan go to medical school?
Happy Chan graduated from Arizona College of Osteopathic Medicine - Glendale in 2001.
What drugs does Happy Chan prescribe most?
In 2017 Medicare Part D data, Happy Chan's most prescribed drugs by claims were Hydroxychloroquine Sulfate, Leflunomide and Enbrel Sureclick.
Show 4 more questionsShow fewer questions
How long has Happy Chan been practicing?
Happy Chan graduated from medical school in 2001, 25 years ago.
Does Happy Chan do research?
Dmand AI links 3 publications to Happy Chan.
Who does Happy Chan publish with?
Happy Chan's most frequent co-authors are Mitchell H. Grayson, MD (1 shared paper), Thorvardur R. Halfdanarson, MD (1 shared paper) and Stanley Masaji Naguwa, MD (1 shared paper).
What insurance does Happy Chan accept?
Happy Chan is in network with 3 carriers, including Blue Cross Blue Shield of Massachusetts, Blue Cross Blue Shield of Michigan and HCSC. Medicare plans come from the most carriers, 3. Check the plan with the practice before a visit.
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