NPI registry status
Active
2026 NPPES data Sleep Medicine (Internal Medicine) Physician NPI 1144234865 M.D.
Verify on CMS → Irina Chilian, M.D.
Sleep Medicine (Internal Medicine) Physician in Duarte, 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 859 in Sleep Medicine (Internal 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
803
Medicare Part D claims · 140 beneficiaries · Sleep Medicine (Internal Medicine) Physician avg: 1K
Generic prescribing
91%
generic claims · 9% brand-name · higher generic rates reduce patient out-of-pocket costs
MIPS score
99.1/100
▲ 16 pts above national avg 83.1 · Exceptional
Industry payments
$24.73
1 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
Irina Chilian, M.D. reported a CMS MIPS final score of 99.1/100 - above the 83.1 national average - and filed 803 Medicare Part D claims in 2023.
- 99.1/100
- MIPS score · +16 vs avg
- 803
- Part D claims, 2023
- 91%
- generic prescribing
- Likely
- board-certified (heuristic)
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.
Irina Chilian, M.D.'s MIPS score vs every scored U.S. clinician
CMS Merit-based Incentive Payment System (MIPS) final score, 2023, the federal quality measure
99 Top 9% higher than 91% of 477,587 scored providers
Each bar is a band; taller bars hold more scored providers. 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 Merit-based Incentive Payment System (MIPS) · 2023
Where Irina Chilian, M.D. sits
This provider among sleep medicine (internal medicine) physician peers
Across the 295 sleep medicine (internal medicine) physician providers who report both Medicare Part D prescribing and a MIPS quality score, Irina Chilian, M.D. writes more Part D claims than 53% of them and scores higher on MIPS quality than 94% - placing this provider in the high-volume, high-quality quadrant. Volume reflects patient-panel size and specialty, not quality; the two axes are independent.
Part D claim volume vs MIPS quality, by specialty percentile
Each dot is one sleep medicine (internal medicine) physician peer from a representative sample of 60; the gold marker is Irina Chilian, M.D.. Source: CMS Medicare Part D Prescriber data and the CMS Merit-based Incentive Payment System, 2023.
✓
Board certification likely (heuristic, not verified)
Irina Chilian, M.D. practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + MIPS quality reporting + 1 hospital affiliation - signals consistent with board-certified status. For verified board certification, see CertificationMatters.org (the official ABMS public lookup).
What does the federal data show about Irina Chilian, M.D.?
High performer (top quartile)Primary specialty
Sleep Medicine (Internal Medicine) Physician
Medicare Part D claims
803 39% vs specialty avg
MIPS final score
99.1/100 16 pts vs avg
Specialty distribution in California
How Sleep Medicine (Internal Medicine) Physician compares to other specialties among California providers
Medicare quality performance, MIPS
Irina Chilian, M.D.'s 2023 MIPS final score plotted against the Sleep Medicine (Internal Medicine) Physician national average
- MIPS Final Score
- 99.1/100
- vs 83.1 national avg · 2023 performance year
MIPS final score (Sleep Medicine (Internal Medicine) Physician) - 99.1/100 vs national avg 83.1
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).
Irina Chilian, M.D. appears in the CMS NPPES registry as a Sleep Medicine (Internal Medicine) Physician provider holding M.D. credentials at 1500 DUARTE RD, Duarte, CA, 91010, with a listed phone of (626) 256-4673. NPI 1144234865 was issued on 07/28/2006.
Medicare Part D records for calendar year 2023 show 803 prescription claims written by this provider, covering 140 Medicare beneficiaries and totaling roughly $248K in drug spend, split 9% brand-name and 91% generic by claim count. On the CMS Merit-based Incentive Payment System, this provider earned a Final Score of 99.1/100 for the 2023 performance year (Quality 85.2), compared with the national average of 83.1.
Sleep Medicine (Internal Medicine) Physician is a narrow specialty nationwide, with 859 enrolled providers across 52 states and an average of 1,310 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 | 1144234865 |
|---|---|
| Specialty | Sleep Medicine (Internal Medicine) Physician |
| Credentials | M.D. |
| Gender | Female |
| NPI Issued | 07/28/2006 |
CMS Quality Score (MIPS)
Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.
99.1275
Final Score
Avg: 83.1
85.2396
Quality
100
Promoting Interoperability
Reporting: Group practice
Hospital and facility affiliations
Facilities where Irina Chilian, M.D. bills Medicare from. Star ratings (1-5) are CMS Hospital Compare's "Hospital overall rating" - a composite of mortality, readmission, patient experience, safety, timely care, and efficient use of medical imaging measures. Source: CMS Care Compare.
City OF Hope Medical Foundation
Duarte, CA
Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).
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 Irina Chilian, M.D.. Source: openpaymentsdata.cms.gov.
Total received
$25
Largest payer
Alnylam Pharmaceuticals Inc.
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 Irina Chilian, M.D.. To verify Irina Chilian, M.D.'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 · Generic-heavy
Irina Chilian, M.D. - brand share 9.0%
Sleep Medicine (Internal Medicine) Physician average
9% brand-name claims vs 91% generic, on 803 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.
803
Total Claims
$248K
Total Drug Cost
140
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 1,122
- Total Day Supply
- 32,552
- Brand vs Generic
- 9% brand / 91% generic
- Brand Drug Cost
- $195K
- Generic Drug Cost
- $53K
Patient Demographics
- Average Patient Age
- 68.1 years
- Avg HCC Risk Score
- 2.85
- Gender Split
- 64% female / 36% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Irina Chilian, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2023
- Duloxetine Hcl
Duloxetine Hcl
77 claims
- Lacosamide
Lacosamide
59 claims
- Pregabalin
Pregabalin
55 claims
- Levetiracetam
Levetiracetam
50 claims
- Donepezil Hcl
Donepezil Hcl
46 claims
- Gabapentin
Gabapentin
44 claims
- Topiramate
Topiramate
42 claims
- Primidone
Primidone
36 claims
| Drug | Claims |
|---|---|
| Duloxetine Hcl | 77 |
| Lacosamide | 59 |
| Pregabalin | 55 |
| Levetiracetam | 50 |
| Donepezil Hcl | 46 |
| Gabapentin | 44 |
| Topiramate | 42 |
| Primidone | 36 |
| Memantine Hcl | 30 |
| Ropinirole Hcl | 27 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
More Sleep Medicine (Internal Medicine) Physician in CA →
All providers in California →
Compare specialties →
Sleep Medicine (Internal Medicine) Physician Overview
How Irina Chilian, M.D. fits within the Sleep Medicine (Internal Medicine) Physician landscape nationally.
859
Sleep Medicine (Internal Medicine) Physician Providers in US
52
States with Sleep Medicine (Internal Medicine) Physician
1,310
Avg Claims per Provider
Irina Chilian, M.D.'s 803 claims are below the specialty average of 1,310.
Nearby Sleep Medicine (Internal Medicine) Physician Providers in California
Other clinicians with the same primary specialty enrolled in California, drawn from the same CMS NPPES roster as Chilian.
Dr. Jennifer Acostamadiedo
MD
Santa Cruz, CA
Kathreen Al Ramo
Fresno, CA
Dr. Amir Arfaei
MD
Ventura, CA
Dr. Hovig Artinian
M.D.
Clovis, CA
Dr. Aditya Bhargava
M.D.
Dublin, CA
Compare Sleep Medicine (Internal 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 (Internal 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 Irina Chilian, M.D.'s specialty? ▼
Irina Chilian, M.D. specializes in Sleep Medicine (Internal Medicine) Physician and practices in Duarte, California. Credentials: M.D..
How much does Irina Chilian, M.D. prescribe under Medicare Part D? ▼
In 2023, Irina Chilian, M.D. wrote 803 Medicare Part D claims totaling $248K in drug costs for 140 beneficiaries.
What is Irina Chilian, M.D.'s Medicare quality score? ▼
Irina Chilian, M.D. has a CMS MIPS Final Score of 99.1/100 (Quality: 85.2). The national average MIPS Final Score is 83.1. Source: CMS Merit-based Incentive Payment System (MIPS) 2023.
Where is Irina Chilian, M.D. located? ▼
Irina Chilian, M.D. is located at 1500 DUARTE RD, Duarte, CA, 91010. Phone: (626) 256-4673.
What is Irina Chilian, M.D.'s NPI number? ▼
Irina Chilian, M.D.'s National Provider Identifier (NPI) is 1144234865, issued on 07/28/2006.
Does Irina Chilian, M.D. prescribe more brand-name or generic drugs? ▼
Irina Chilian, M.D.'s prescribing is 9% brand-name and 91% generic drugs by claim count, with $195K in brand drug costs.
How many Sleep Medicine (Internal Medicine) Physician providers are there in the US? ▼
There are 859 Sleep Medicine (Internal Medicine) Physician providers across 52 states in the US. The average Sleep Medicine (Internal Medicine) Physician provider writes 1,310 Medicare Part D claims per year.
What drugs does Irina Chilian, M.D. prescribe most often? ▼
Based on 2023 Medicare Part D data, Irina Chilian, M.D.'s most frequently prescribed drugs include Duloxetine Hcl, Lacosamide, Pregabalin. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Irina Chilian, M.D. accept Medicare? ▼
Irina Chilian, M.D. appears in CMS Medicare data with 803 Part D claims and 140 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Irina Chilian, M.D.'s credentials? ▼
Irina Chilian, M.D.'s NPI is 1144234865 with credentials M.D.. 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.
- Quality Performance
- CMS Merit-based Incentive Payment System (MIPS) - 2023 performance year.
- 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.