NPI registry status
Active
2026 NPPES data Hematology & Oncology Physician NPI 1154409720 MD
Verify on CMS → Chunnan Liu, MD
Hematology & Oncology Physician in Walnut Creek, 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 11,232 in Hematology & Oncology 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
960
Medicare Part D claims · 286 beneficiaries · Hematology & Oncology Physician avg: 847
Generic prescribing
78%
generic claims · 22% brand-name · higher generic rates reduce patient out-of-pocket costs
Source: CMS Medicare Part D Prescriber Public Use File, 2023
What the federal data shows
Chunnan Liu, MD filed 960 Medicare Part D claims in 2023 as a Hematology & Oncology Physician in Walnut Creek, California, prescribing 78% generic.
- 960
- Part D claims, 2023
- 78%
- 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.
Chunnan Liu, MD's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
960 Top 25% higher than 75% 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 certification likely (heuristic, not verified)
Chunnan Liu, MD practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + 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 Chunnan Liu, MD?
Quality data not reportedPrimary specialty
Hematology & Oncology Physician
Medicare Part D claims
960 13% vs specialty avg
Specialty distribution in California
How Hematology & Oncology 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 Hematology & Oncology 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).
Chunnan Liu, MD appears in the CMS NPPES registry as a Hematology & Oncology Physician provider holding MD credentials at 1425 S MAIN ST, Walnut Creek, CA, 94596, with a listed phone of (925) 295-4000. NPI 1154409720 was issued on 11/01/2006.
Medicare Part D records for calendar year 2023 show 960 prescription claims written by this provider, covering 286 Medicare beneficiaries and totaling roughly $2.9 million in drug spend, split 22% brand-name and 78% generic by claim count, with an opioid prescribing rate of 6.5%.
Hematology & Oncology Physician is a mid-sized specialty nationwide, with 11,232 enrolled providers across 54 states and an average of 847 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 | 1154409720 |
|---|---|
| Specialty | Hematology & Oncology Physician |
| Credentials | MD |
| Gender | Female |
| NPI Issued | 11/01/2006 |
Hospital and facility affiliations
Facilities where Chunnan Liu, MD 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.
Permanente Medical Group Inc
Richmond, 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).
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 Chunnan Liu, MD. To verify Chunnan Liu, 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 · Typical
Chunnan Liu, MD - brand share 22.0%
Hematology & Oncology Physician average
22% brand-name claims vs 78% generic, on 960 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.
960
Total Claims
$2.9M
Total Drug Cost
286
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 1,947
- Total Day Supply
- 53,686
- Brand vs Generic
- 22% brand / 78% generic
- Brand Drug Cost
- $2.7M
- Generic Drug Cost
- $209K
- Opioid Claims
- 62 (6.5% rate)
Patient Demographics
- Average Patient Age
- 74.5 years
- Avg HCC Risk Score
- 1.83
- Gender Split
- 85% female / 15% male
- Age Distribution
- <65: 12, 65-74: 143, 75-84: 107, 85+: 24
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Chunnan Liu, MD prescribes most
Top Medicare Part D drugs by claim count, 2023
- Letrozole
Letrozole
257 claims
- Ibrance 67
Ibrance
67 claims
- Tamoxifen Citrate 47
Tamoxifen Citrate
47 claims
- Exemestane 36
Exemestane
36 claims
- Dexamethasone 35
Dexamethasone
35 claims
- Hydrocodone-Acetam… 35
Hydrocodone-Acetaminophen
35 claims
- Anastrozole 34
Anastrozole
34 claims
- Kisqali 30
Kisqali
30 claims
| Drug | Claims |
|---|---|
| Letrozole | 257 |
| Ibrance Palbociclib | 67 |
| Tamoxifen Citrate | 47 |
| Exemestane | 36 |
| Dexamethasone | 35 |
| Hydrocodone-Acetaminophen Hydrocodone/Acetaminophen | 35 |
| Anastrozole | 34 |
| Kisqali Ribociclib Succinate | 30 |
| Lynparza Olaparib | 30 |
| Gabapentin | 27 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Hematology & Oncology Physician Overview
How Chunnan Liu, MD fits within the Hematology & Oncology Physician landscape nationally.
11,232
Hematology & Oncology Physician Providers in US
54
States with Hematology & Oncology Physician
847
Avg Claims per Provider
Chunnan Liu, MD's 960 claims are above the specialty average of 847.
Nearby Hematology & Oncology Physician Providers in California
Other clinicians with the same primary specialty enrolled in California, drawn from the same CMS NPPES roster as Liu.
Dr. Mark Abate
M.D.
Santa Barbara, CA
Dr. Iman Abdalla
MD
Los Angeles, CA
Dr. Nihal Abdulla
MD
Los Alamitos, CA
Dr. Oyewale Abidoye
M.D.
La Jolla, CA
Dr. Mohamad Adada
M.D., PHD
Roseville, CA
Compare Hematology & Oncology 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 Hematology & Oncology 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 Chunnan Liu, MD's specialty? ▼
Chunnan Liu, MD specializes in Hematology & Oncology Physician and practices in Walnut Creek, California. Credentials: MD.
How much does Chunnan Liu, MD prescribe under Medicare Part D? ▼
In 2023, Chunnan Liu, MD wrote 960 Medicare Part D claims totaling $2.9M in drug costs for 286 beneficiaries.
Where is Chunnan Liu, MD located? ▼
Chunnan Liu, MD is located at 1425 S MAIN ST, Walnut Creek, CA, 94596. Phone: (925) 295-4000.
What is Chunnan Liu, MD's NPI number? ▼
Chunnan Liu, MD's National Provider Identifier (NPI) is 1154409720, issued on 11/01/2006.
Does Chunnan Liu, MD prescribe more brand-name or generic drugs? ▼
Chunnan Liu, MD's prescribing is 22% brand-name and 78% generic drugs by claim count, with $2.7M in brand drug costs.
Does Chunnan Liu, MD prescribe opioids? ▼
Yes, Chunnan Liu, MD had 62 opioid claims in 2023 with an opioid prescribing rate of 6.5%.
How many Hematology & Oncology Physician providers are there in the US? ▼
There are 11,232 Hematology & Oncology Physician providers across 54 states in the US. The average Hematology & Oncology Physician provider writes 847 Medicare Part D claims per year.
What drugs does Chunnan Liu, MD prescribe most often? ▼
Based on 2023 Medicare Part D data, Chunnan Liu, MD's most frequently prescribed drugs include Letrozole, Ibrance, Tamoxifen Citrate. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Chunnan Liu, MD accept Medicare? ▼
Chunnan Liu, MD appears in CMS Medicare data with 960 Part D claims and 286 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Chunnan Liu, MD's credentials? ▼
Chunnan Liu, MD's NPI is 1154409720 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
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.