NPI registry status
Active
2026 NPPES data Sleep Medicine (Family Medicine) Physician NPI 1740290378 MD
Verify on CMS → Mark Chung, MD
Sleep Medicine (Family Medicine) Physician in Cerritos, California.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 193 in Sleep Medicine (Family Medicine) Physician, and covers specialty classification, practice address, and Medicare Part D prescribing data when reported. According to CMS, every field reflects the provider's official federal registration, see our methodology.
Federal data, no proprietary rating.
We show these CMS records as-is - no composite score, no star rating, no editorial opinion layered on top.
Prescribing volume
1K
Medicare Part D claims · 327 beneficiaries · Sleep Medicine (Family Medicine) Physician avg: 2K
Generic prescribing
71%
generic claims · 27% brand-name · higher generic rates reduce patient out-of-pocket costs
Industry payments
$747.27
21 payments · CMS Open Payments (Sunshine Act)
Source: CMS Medicare Part D Prescriber Public Use File, 2023
Compiled from official public sources by the PlainDoctor editorial team.
What the federal data shows
Mark Chung, MD filed 1,358 Medicare Part D claims in 2023 as a Sleep Medicine (Family Medicine) Physician in Cerritos, California, prescribing 71% generic.
- 1K
- Part D claims, 2023
- 71%
- generic prescribing
- $747.27
- industry payments (Sunshine Act)
Every figure on this page comes straight from federal CMS records (NPPES, Medicare Part D, MIPS, Open Payments) - no proprietary rating or editorial opinion is applied.
Mark Chung, MD's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
1,358 Top 21% higher than 79% of 1,370,886 prescribers
Each bar is a band; taller bars hold more prescribers. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.
Source CMS Medicare Part D Prescriber Public Use File · 2023
◑
Board-eligible specialty (heuristic, not verified)
Mark Chung, MD practices in an ABMS-board-eligible specialty but we don't have enough CMS-participation signals to confirm active board-certified status. Consult CertificationMatters.org (the official ABMS public lookup).
What does the federal data show about Mark Chung, MD?
Quality data not reportedPrimary specialty
Sleep Medicine (Family Medicine) Physician
Medicare Part D claims
1,358 10% vs specialty avg
Specialty distribution in California
How Sleep Medicine (Family Medicine) Physician compares to other specialties among California providers
Board certification
Not published by CMS
CMS does not publish a per-provider board-certification field in NPPES. PlainDoctor does not have a reliable per-specialty certification rate to show for Sleep Medicine (Family Medicine) Physician. Verify directly:
How MIPS and board certification work
The Merit-based Incentive Payment System (MIPS) scores providers 0–100 across four performance categories: Quality, Cost, Promoting Interoperability, and Improvement Activities, weighted under 42 CFR §414.1380. Reporting is voluntary for many small practices, so absence of a MIPS score is not a quality signal.
Board certification through an ABMS or AOA member board signals voluntary post-licensure examination plus continuous Maintenance of Certification cycles. Verify any individual provider's status through certificationmatters.org (ABMS) or osteopathic.org (AOA).
Mark Chung, MD appears in the CMS NPPES registry as a Sleep Medicine (Family Medicine) Physician provider holding MD credentials at 11821 SOUTH ST, Cerritos, CA, 90703, with a listed phone of (562) 991-5679. NPI 1740290378 was issued on 08/08/2006.
Medicare Part D records for calendar year 2023 show 1,358 prescription claims written by this provider, covering 327 Medicare beneficiaries and totaling roughly $245K in drug spend, split 27% brand-name and 71% generic by claim count.
Sleep Medicine (Family Medicine) Physician is a narrow specialty nationwide, with 193 enrolled providers across 45 states and an average of 1,506 Part D claims per prescriber, so the context for interpreting these metrics differs meaningfully from a primary-care baseline.
Important: PlainDoctor is a directory of publicly available government data, not medical advice, a malpractice database, or a quality rating. Inclusion here does not imply a recommendation, and absence of complaints or sanctions on this page does not mean none exist, always verify credentials through the NPPES NPI Registry, your state medical board, and the ABMS or AOA before making healthcare decisions.
Practice Address
Provider Details
| NPI | 1740290378 |
|---|---|
| Specialty | Sleep Medicine (Family Medicine) Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 08/08/2006 |
Industry payments received (2024) - CMS Open Payments transparency data
The federal Physician Payments Sunshine Act (part of the Affordable Care Act) requires drug and medical-device manufacturers + group purchasing organizations to publicly report payments and other transfers of value to physicians and teaching hospitals. The data below covers 2024 for Mark Chung, MD. Source: openpaymentsdata.cms.gov.
Total received
$747
Largest payer
GlaxoSmithKline, LLC.
Most common payment type
Food and Beverage
Industry payments are not necessarily indicators of bias, they include research funding, consulting fees for evidence-based work, royalties for inventions, food at conferences, and similar items. The disclosure exists for transparency. Read our methodology for how we interpret this data.
License & disciplinary context - California MBC 2023 annual report
Aggregate state board data only, NOT a determination of any individual provider's status. The figures below describe statewide disciplinary activity across all ~150K California medical licensees in 2023 - they are NOT specific to Mark Chung, MD. To verify Mark Chung, MD's current license status, search the MBC public license lookup directly, or check the Federation of State Medical Boards (FSMB) verification service.
576
Total board actions, California 2023
Across 556 cases
3.84
Actions per 1,000 licensees
California statewide rate
probation
Most common action type
186 cases
MBC publishes annual disciplinary statistics as part of public-record reporting under each state's Administrative Procedure Act. See the full breakdown by action type and year on the California disciplinary trends page. Cross-checked against FSMB U.S. Medical Regulatory Trends.
Brand vs generic prescribing mix · Above average
Mark Chung, MD - brand share 27.0%
Sleep Medicine (Family Medicine) Physician average
27% brand-name claims vs 71% generic, on 1,358 2023 Medicare Part D claims.
The federal Medicare Part D Generic Dispensing Rate national benchmark sits near 90% generic / 10% brand for primary-care prescribers, per CMS Office of the Actuary 2024 estimates. Higher brand share is common in specialty prescribing where generic equivalents are not available.
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2023.
1,358
Total Claims
$245K
Total Drug Cost
327
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 1,768
- Total Day Supply
- 46,293
- Brand vs Generic
- 27% brand / 71% generic
- Brand Drug Cost
- $203K
- Generic Drug Cost
- $43K
- Antibiotic Claims
- 131
Patient Demographics
- Average Patient Age
- 70.1 years
- Avg HCC Risk Score
- 1.06
- Gender Split
- 64% female / 36% male
- Age Distribution
- <65: 46, 65-74: 187, 75-84: 78, 85+: 16
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Mark Chung, MD prescribes most
Top Medicare Part D drugs by claim count, 2023
- Ipratropium Bromide
Ipratropium Bromide
164 claims
- Montelukast Sodium
Montelukast Sodium
131 claims
- Trelegy Ellipta
Trelegy Ellipta
123 claims
- Albuterol Sulfate …
Albuterol Sulfate Hfa
71 claims
- Eszopiclone 49
Eszopiclone
49 claims
- Prednisone 41
Prednisone
41 claims
- Gabapentin 39
Gabapentin
39 claims
- Trazodone Hcl 39
Trazodone Hcl
39 claims
| Drug | Claims |
|---|---|
| Ipratropium Bromide | 164 |
| Montelukast Sodium | 131 |
| Trelegy Ellipta Fluticasone/Umeclidin/Vilanter | 123 |
| Albuterol Sulfate Hfa Albuterol Sulfate | 71 |
| Eszopiclone | 49 |
| Prednisone | 41 |
| Gabapentin | 39 |
| Trazodone Hcl | 39 |
| Zolpidem Tartrate | 36 |
| Roflumilast | 34 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
More Sleep Medicine (Family Medicine) Physician in CA →
All providers in California →
Compare specialties →
Sleep Medicine (Family Medicine) Physician Overview
How Mark Chung, MD fits within the Sleep Medicine (Family Medicine) Physician landscape nationally.
193
Sleep Medicine (Family Medicine) Physician Providers in US
45
States with Sleep Medicine (Family Medicine) Physician
1,506
Avg Claims per Provider
Mark Chung, MD's 1,358 claims are below the specialty average of 1,506.
Nearby Sleep Medicine (Family Medicine) Physician Providers in California
Other clinicians with the same primary specialty enrolled in California, drawn from the same CMS NPPES roster as Chung.
Dr. Saqib Ansari
MD
Capitola, CA
Dr. Dana Awad
MD
Fontana, CA
Dr. Meneena Bright
MD
Newport Beach, CA
Dr. Kevin Byrne
MD
San Diego, CA
Dr. Donna Eugenio
RCP/CRTT
San Leandro, CA
Compare Sleep Medicine (Family Medicine) Physician nationally: see state-by-state distribution →
Before you book an appointment
Use this federal record as your verification checklist, not as a recommendation.
- Confirm the NPI record is current in the official CMS registry, providers update their own NPPES details, and moves can lag. Verify this NPI
- Check the active license and any disciplinary history with the California medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Sleep Medicine (Family Medicine) Physician peer on Medicare volume and prescribing patterns. Compare providers
Medicare Part D and MIPS figures describe practice patterns in federal programs only, they are not quality ratings, and PlainDoctor does not rate, rank, or recommend providers.
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Frequently Asked Questions
What is Mark Chung, MD's specialty? ▼
Mark Chung, MD specializes in Sleep Medicine (Family Medicine) Physician and practices in Cerritos, California. Credentials: MD.
How much does Mark Chung, MD prescribe under Medicare Part D? ▼
In 2023, Mark Chung, MD wrote 1,358 Medicare Part D claims totaling $245K in drug costs for 327 beneficiaries.
Where is Mark Chung, MD located? ▼
Mark Chung, MD is located at 11821 SOUTH ST, Cerritos, CA, 90703. Phone: (562) 991-5679.
What is Mark Chung, MD's NPI number? ▼
Mark Chung, MD's National Provider Identifier (NPI) is 1740290378, issued on 08/08/2006.
Does Mark Chung, MD prescribe more brand-name or generic drugs? ▼
Mark Chung, MD's prescribing is 27% brand-name and 71% generic drugs by claim count, with $203K in brand drug costs.
How many Sleep Medicine (Family Medicine) Physician providers are there in the US? ▼
There are 193 Sleep Medicine (Family Medicine) Physician providers across 45 states in the US. The average Sleep Medicine (Family Medicine) Physician provider writes 1,506 Medicare Part D claims per year.
What drugs does Mark Chung, MD prescribe most often? ▼
Based on 2023 Medicare Part D data, Mark Chung, MD's most frequently prescribed drugs include Ipratropium Bromide, Montelukast Sodium, Trelegy Ellipta. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Mark Chung, MD accept Medicare? ▼
Mark Chung, MD appears in CMS Medicare data with 1,358 Part D claims and 327 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Mark Chung, MD's credentials? ▼
Mark Chung, MD's NPI is 1740290378 with credentials MD. You can verify this through the NPPES NPI Registry, check state medical board records, and confirm board certification through the ABMS or AOA.
Data Sources
View source datasets and methodology notes
- Provider Directory
- CMS National Plan and Provider Enumeration System (NPPES), download.cms.gov/nppes, updated monthly. Contains NPI, specialty, credentials, and practice location.
- Specialty Classification
- NUCC Health Care Provider Taxonomy (nucc.org), the industry standard for classifying provider specialties in Medicare and Medicaid billing.
- Prescribing Data
- CMS Medicare Part D Prescriber Public Use File (2023). Includes claims, drug costs, beneficiaries, and opioid prescribing rates.
- Limitations
- Provider data is self-reported to CMS. Prescribing data reflects Medicare Part D only and does not include commercial insurance, Medicaid, or cash prescriptions. Claims below 11 beneficiaries are suppressed by CMS for privacy.
See our complete data methodology for details on how we collect and process government data.
Data as of April 2026 (NPPES) / 2023 (Medicare Part D). Source: Centers for Medicare & Medicaid Services (CMS).
Disclaimer: Data from CMS NPPES and Medicare Part D. PlainDoctor does not rate or rank providers. Provider information is self-reported and may not be current. Always verify information directly with the provider. About · Methodology
Compiled from official public sources by the PlainDoctor editorial team.
Every figure on PlainDoctor is rendered directly from the federal CMS NPPES registry, Medicare Part D, MIPS, and Open Payments records, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of May 2026.