Dr. Mason Shieh, MBA, MD

  • Orange, CA
  • Emergency medicine physician
NPI1467718486PAC ID5092027292
Medicare services, 2024
778
Medicare patients, 2024
456
Part D claims, 2024
365
Publications
6
MIPS score, 2024
97
Practice address
101 City Drive South, Orange, CA 92868
Practice phone
Call (714) 456-7890
Professional email
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Personal email
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Mobile number
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Social profiles

Primary practice

UCI Health - Orange

Hospital · Orange, California

See all 5 affiliations

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Dr. Mason Shieh is an emergency medicine physician in Orange, California

Dr. Shieh practices at UCI Health - Orange in Orange, California, part of UC Irvine.

Dr. Shieh's NPI, 1467718486, was assigned on April 3, 2012. Dr. Shieh graduated from University of California, Irvine, California College of Medicine in 2012. Dr. Shieh holds California license A134394.

NPI and contact details
Medicare PAC ID
5092027292
NPI enumeration date
April 3, 2012
NPI status
Active
Accepts Medicare assignment
Yes
Practice phone
(714) 456-7890
Professional email
Get email
Personal email
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Mobile number
Get number
Sex
Male
Estimated age
40
Medical school graduation
2012

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

Dr. Mason Shieh practices at UCI Health - Orange in Orange, California

Dr. Shieh's primary practice is UCI Health - Orange, at 101 City Drive South, Orange, CA 92868 in Orange County. The practice phone is (714) 456-7890.

  • UCI Health - Orange
    101 City Drive South, Orange, CA 92868 · Orange CountyPhone(714) 456-7890

Source: Dmand AI Affiliation Data

Dr. Mason Shieh is affiliated with 3 sites of care and 2 medical groups

Dr. Shieh's primary practice is UCI Health - Orange in Orange, California, part of UC Irvine. Dr. Shieh is also affiliated with UCI Health - Lakewood. The medical group on file is Vituity. Dmand AI also links Dr. Shieh to 1 more hospital and 1 medical group, each named with a free account.

See all 5 affiliations for Dr. Shieh

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

Dmand AI tracks the EHR system at Dr. Mason Shieh's practice

Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Shieh practices, 3 sites in all. Vendor and product names are available with a free account.

EHR by site
SiteEHR vendor and product
UCI Health - OrangeAvailable with a free account
+2 more sites and 1 medical groupAvailable with a free account

Source: Dmand AI Technology Install Data

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Dr. Mason Shieh is one of 7,423 emergency medicine physicians in California

Emergency medicine is Dr. Shieh's primary specialty in the NPI Registry, under taxonomy code 207P00000X. Dr. Shieh is board certified in emergency medicine by the American Board of Emergency Medicine. Dr. Shieh is licensed in California.

Specialties and state licenses

  • Emergency medicine, CaliforniaPrimaryLicense A134394 · 2011 to 2026 · taxonomy 207P00000X

Emergency medicine physicians near Dr. Shieh

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. Mason Shieh billed Medicare for 778 services in 2024

CMS data shows 778 Medicare services from Dr. Shieh across 4 procedure codes in 2024, for 456 Medicare patients. Medicare paid $75,225 for them. Every service was in a facility, such as a hospital, rather than an office.

Medicare services, 2024778
Medicare patients456
Paid by Medicare$75,225
Procedure codes4

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

  • 2023
  • 2024
Office and hospital visits
2023: 2782024: 47872%
Tests and treatments
2023: 722024: 300317%

Dr. Shieh compared with the California median for emergency medicine physicians, 2024

  • Dr. Shieh
  • California median
Medicare services
778vs 2652.9 times
Medicare patients
456vs 24388% above
Part D claims
220vs 623.5 times

Medians across 7,079 emergency medicine physicians in California with Dmand AI profiles that report each measure.

Dr. Shieh'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. Shieh

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

Dr. Mason Shieh treated 456 Medicare patients in 2024, average age 73

CMS counts 456 Medicare patients who saw Dr. Shieh in 2024. The largest group is 65 to 74, with 161 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 68% are also on Medicaid. Their average risk score is 3.08, 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. Shieh's median patient age at 55, with 56% women.

Medicare patients, 2024456
Average age73
Average risk score3.08
Also on Medicaid68%

Dr. Shieh's Medicare patients by age, 2024

Dr. Shieh's Medicare patients by sex, 2024

  • Women24253%
  • Men21447%

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

  1. High blood pressure75%
  2. High cholesterol75%
  3. Diabetes59%
  4. Arthritis51%
  5. Chronic kidney disease51%
  6. Heart failure47%
  7. Mood disorders45%
  8. Ischemic heart disease39%

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

Dr. Shieh's patients across all payers

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

Patient panel by age, all payers

Median age 55

Patient panel by sex, all payers

  • Women56%
  • Men44%

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

Dr. Mason Shieh wrote 365 Medicare Part D claims in 2024

In 2024, Dr. Shieh wrote 365 Medicare Part D claims for 230 patients. 95% of them were for generic drugs. CMS names the drug for 220 of them, across 11 drugs with 11 or more claims each, at $2,379 in total drug cost. In 2023, CMS named 197 claims across 9 drugs.

Part D claims, 2024365
Drugs named by CMS11
Total drug cost$2,379
Part D patients230

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

  • Generic347 claims95%
  • Brand-name and other18 claims5%

Dr. Shieh'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.

Drug classes CMS tracks in Dr. Shieh's Part D claims, 2024

  • Opioids15%54 of 365 claims
  • Antibiotics36%130 of 365 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, 2023 to 2024

  • 2023
  • 2024
Claims for drugs CMS names
2023: 1972024: 22012%

Drugs named by CMS: 11 in 2024, 9 in 2023.

See all prescribing by Dr. Shieh

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. Mason Shieh scored 97 out of 100 in Medicare's MIPS program for 2024

CMS publishes a Merit-based Incentive Payment System (MIPS) score of 97 out of 100 for Dr. Shieh for performance year 2024, reported as part of a group. Dr. Shieh accepts Medicare assignment, so Medicare's approved amount is taken as full payment.

Accepts Medicare assignment
Yes

Dr. Shieh's MIPS scores, performance year 2024

  • 97of 100Final score
  • 90of 100Quality
  • 40of 100Improvement Activities
  • 78of 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. Mason Shieh has 6 publications on record

Dmand AI links 6 papers to Dr. Shieh, published from 2009 to 2017. Dr. Shieh's most frequent co-authors are Bassil Aish, MD, Arash Anavim, MD and Evan Michael Bishop-Rimmer, MD.

Papers6
Years published2009 to 2017

Dr. Shieh's papers by year, 2009 to 2017

Dr. Shieh's most frequent co-authors

Recent publications by Dr. Shieh

See all 6 publications and co-authors

See who Dr. Shieh researches with

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

How network discovery works

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

Dr. Mason Shieh received $392 in industry payments from 2016 to 2023

CMS Open Payments shows 3 general payments to Dr. Shieh from 3 drug and device companies from 2016 to 2023. Food and beverage make up the largest share, 100% of the total. Inari Medical, Inc. paid the most, $168.

General payments to Dr. Shieh by program year, 2016 to 2023

Companies that paid Dr. Shieh the most, 2016 to 2023

Share is of all general payments to this clinician.

See all payments to Dr. Shieh

Source: Open Payments (CMS), 2025 data, released July 7, 2026

Dr. Mason Shieh graduated from University of California, Irvine, California College of Medicine

Dr. Shieh graduated from University of California, Irvine, California College of Medicine in 2012.

  1. Medical schoolUniversity of California, Irvine, California College of Medicine
  2. Board certified in emergency medicineAmerican Board of Emergency Medicine

Source: Dmand AI Professional Profile Data

Dr. Mason Shieh accepts plans from 2 insurance carriers

Dr. Shieh is in network with 2 carriers, including CMS Medicare and Molina. Medicare plans come from the most carriers, 2. Check the plan with the practice before a visit.

  • CMS Medicare
  • Molina

Source: Dmand AI Insurance Network Data

Sources for Dr. Mason Shieh'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
Industry paymentsOpen Payments (CMS) (opens in a new tab)
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. Mason Shieh

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. Mason Shieh's NPI number?

Dr. Mason Shieh's NPI number is 1467718486. It was assigned on April 3, 2012, and it is active in the NPI Registry.

What kind of doctor is Dr. Mason Shieh?

Dr. Mason Shieh is an emergency medicine physician in Orange, California. The primary specialty in the NPI Registry is Emergency Medicine Physician (taxonomy code 207P00000X).

Where does Dr. Mason Shieh practice?

Dr. Shieh practices at 101 City Drive South, Orange, CA 92868. Dr. Shieh's primary practice is UCI Health - Orange in Orange, California, part of UC Irvine. Dmand AI also links Dr. Shieh to 1 hospital and 1 medical group.

What is Dr. Mason Shieh's office phone number?

The practice phone on file for Dr. Shieh is (714) 456-7890.

What is Dr. Mason Shieh's medical license number?

Dr. Shieh holds California license A134394.

Which hospitals is Dr. Mason Shieh affiliated with?

Dr. Shieh practices at UCI Health - Orange in Orange, California. Dr. Shieh is also affiliated with UCI Health - Lakewood. Dmand AI links Dr. Shieh to 1 more hospital.

What medical group is Dr. Mason Shieh part of?

Dr. Shieh is linked to Vituity. Dmand AI links Dr. Shieh to 1 more medical group.

Does Dr. Mason Shieh accept Medicare?

Yes. CMS data shows Dr. Shieh billed Medicare for 778 services in 2024, and Dr. Shieh accepts Medicare assignment.

What is Dr. Mason Shieh's MIPS score?

Dr. Shieh's MIPS final score for performance year 2024 is 97 out of 100, reported as part of a group.

How many Medicare patients does Dr. Mason Shieh see?

CMS counts 456 Medicare patients who saw Dr. Shieh in 2024, with an average age of 73.

Show 9 more questionsShow fewer questions

Is Dr. Mason Shieh board certified?

Yes. Dr. Shieh is board certified in emergency medicine by the American Board of Emergency Medicine.

What services does Dr. Mason Shieh bill to Medicare?

In 2024, Dr. Shieh's most billed Medicare services were emergency department visit (99285), heart test or procedure (93010) and critical care (99291).

Where did Dr. Mason Shieh go to medical school?

Dr. Shieh graduated from University of California, Irvine, California College of Medicine in 2012.

What drugs does Dr. Mason Shieh prescribe most?

In 2024 Medicare Part D data, Dr. Shieh's most prescribed drugs by claims were Ondansetron ODT, Cephalexin and Hydrocodone-Acetaminophen.

Has Dr. Mason Shieh received payments from drug or device companies?

CMS Open Payments shows $392 in general payments to Dr. Shieh from 3 companies from 2016 to 2023. The largest total came from Inari Medical, Inc.

How long has Dr. Mason Shieh been practicing?

Dr. Shieh graduated from medical school in 2012, 14 years ago.

Does Dr. Mason Shieh do research?

Dmand AI links 6 publications to Dr. Shieh, published from 2009 to 2017.

Who does Dr. Mason Shieh publish with?

Dr. Shieh's most frequent co-authors are Bassil Aish, MD (1 shared paper), Arash Anavim, MD (1 shared paper) and Evan Michael Bishop-Rimmer, MD (1 shared paper).

What insurance does Dr. Mason Shieh accept?

Dr. Shieh is in network with 2 carriers, including CMS Medicare and Molina. Medicare plans come from the most carriers, 2. Check the plan with the practice before a visit.

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