NPI registry status
Active
2026 NPPES data Hematology & Oncology Physician NPI 1134564610 MD
Verify on CMS → Emerson Chen, MD
Hematology & Oncology Physician in Portland, Oregon.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 11,530 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
584
Medicare Part D claims · 64 beneficiaries · Hematology & Oncology Physician avg: 885
MIPS score
97.8/100
▲ 14 pts above national avg 83.5 · Exceptional
Industry payments
$37.24
1 payments · CMS Open Payments (Sunshine Act)
What the federal data shows
Emerson Chen, MD reported a CMS MIPS final score of 97.8/100 - above the 83.5 national average - and filed 584 Medicare Part D claims in 2024.
- 97.8/100
- MIPS score · +14 vs avg
- 584
- Part D claims, 2024
- Likely
- board-certified (heuristic)
- ≥84th
- pct among measured MIPS (lower-bound band)
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.
Federal trust snapshot
What official records show about Emerson Chen, MD
Federal records show an active NPI with both Medicare prescribing volume and a measured CMS quality score — objective registry data, not patient reviews.
- Verified
NPI registry status
Active listing in the CMS National Provider Identifier Registry (NPI 1134564610), first enumerated 05/09/2013.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 584 Medicare Part D prescription claims in the 2023 CMS public use file — indicates active Medicare prescribing participation.
Source: CMS Part D Prescriber PUF
- Reported
CMS quality reporting (MIPS)
Reported a CMS MIPS final score of 97.8/100 in the Quality Payment Program — a federal quality measure, not a patient review.
Source: CMS Quality Payment Program
- Reported
Board certification signal
Heuristic suggests board-certified status based on ABMS-eligible specialty taxonomy plus active CMS participation signals — not a direct ABMS verification.
- Reported
Hospital affiliations
1 CMS Care Compare hospital affiliation on record — practice footprint from the Doctors and Clinicians file.
Source: CMS Care Compare
- Reported
Industry payment transparency
$37.24 in reported industry payments (1 transfers) in 2024 under the federal Sunshine Act — disclosed transfers of value, not a quality rating.
Source: CMS Open Payments
- Not in federal data
Individual sanction lookup
PlainDoctor does not publish per-provider disciplinary determinations. Confirm current license and any individual actions through the state medical board or FSMB verification service.
Source: State medical board / FSMB
This trust snapshot summarizes only what appears in federal CMS/NPPES public records. It is not a composite score, star rating, patient review, or clinical recommendation. PlainDoctor never fabricates reviews or AggregateRating schema.
CMS NPPES provider registry desk
NPI 1134564610 · Hematology & Oncology Physician
NPI-10 · ENUM-MID · TAX-MID · MIPS-ELITE · RX-LIGHT · BOOK-THIN · PHOTO-FINISH
- NPI-10 1134564610
- ENUM-MID 2013
- TAX-MID 12K Hematology &
- MIPS-ELITE 97.8/100
- RX-LIGHT 584
- BOOK-THIN 140 in Oregon
- PHOTO-FINISH Luis Rangel · ±0.0
MIPS final-score neighbourhood
Same-specialty nationwide peers by CMS final score, not geographic proximity
- Chen · this prov…
Chen · this provider
97.8 MIPS pts
- Annie Hung · near
Annie Hung
97.8 MIPS pts
- Luis Rangel · near
Luis Rangel
97.8 MIPS pts
- Eric Santos · near
Eric Santos
97.8 MIPS pts
- Noah Lindenberg …
Noah Lindenberg
97.9 MIPS pts
What this shows Nearest measured MIPS peers for this NUCC specialty (2023 performance year).
Emerson Chen, MD's MIPS score vs every measured U.S. clinician
CMS Merit-based Incentive Payment System (MIPS) final score, 2023, the federal quality measure. Clinicians whose score CMS assigned without scoring any category are excluded.
98 ≥ 84th percentile 84% of 454,083 measured providers are in lower value bands
Each bar is a band; taller bars hold more measured 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.
The percentile is a conservative whole-score-point band: it counts only measured clinicians in lower score bands. A CMS MIPS metric is not a recommendation or a clinical-quality rating by PlainDoctor. See methodology § corpus placement.
Source CMS Merit-based Incentive Payment System (MIPS) · 2023
Where Emerson Chen, MD sits
This provider among hematology & oncology physician peers
Across the 4,019 hematology & oncology physician providers who report both Medicare Part D prescribing and a MIPS quality score, Emerson Chen, MD writes more Part D claims than 42% of them and scores higher on MIPS quality than 84% - placing this provider in the lower-volume, high-quality quadrant. Volume reflects patient-panel size and specialty, not quality; the two axes are independent.
Each dot is one hematology & oncology physician peer from a representative sample of 60; the gold marker is Emerson Chen, MD. Source: CMS Medicare Part D Prescriber data and the CMS Merit-based Incentive Payment System, 2023.
✓
Board certification likely (heuristic, not verified)
Emerson Chen, MD 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 Emerson Chen, MD?
High performer (top quartile)Primary specialty
Hematology & Oncology Physician
Medicare Part D claims
584 34% vs specialty avg
MIPS final score
97.8/100 14.3 pts vs avg
Specialty distribution in Oregon
How Hematology & Oncology Physician compares to other specialties among Oregon providers
Medicare quality performance, MIPS
Emerson Chen, MD's 2023 MIPS final score plotted against the Hematology & Oncology Physician national average
- MIPS Final Score
- 97.8/100
- vs 83.5 national avg · 2023 performance year
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).
Practice Address
Provider Details
| NPI | 1134564610 |
|---|---|
| Specialty | Hematology & Oncology Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 05/09/2013 |
CMS Quality Score (MIPS)
Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.
97.83
Final Score
Measured-score avg: 83.5
80.9759
Quality
100
Promoting Interoperability
Reporting: Alternative Payment Model
Hospital and facility affiliations
Facilities where Emerson Chen, 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.
University Professional Services
Beaverton, OR
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 Emerson Chen, MD. Source: openpaymentsdata.cms.gov.
Total received
$37
Largest payer
Daiichi Sankyo 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.
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2024.
584
Total Claims
$508K
Total Drug Cost
64
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 661.533
- Total Day Supply
- 15,674
- Generic Drug Cost
- $11K
- Opioid Claims
- 17 (2.9% rate)
- Antibiotic Claims
- 18
Patient Demographics
- Average Patient Age
- 69.3 years
- Avg HCC Risk Score
- 2.93
- Gender Split
- 47% female / 53% male
- Age Distribution
- <65: 12, 65-74: 35, 75-84: N/A, 85+: N/A
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2024. Based on Medicare Part D data only.
What Emerson Chen, MD prescribes most
Top Medicare Part D drugs by claim count, 2024
- Dexamethasone
Dexamethasone
66 claims
- Prochlorperazine M…
Prochlorperazine Maleate
57 claims
- Ondansetron Odt
Ondansetron Odt
36 claims
- Loperamide
Loperamide
28 claims
- Creon 25
Creon
25 claims
- Omeprazole 24
Omeprazole
24 claims
- Pantoprazole Sodium 24
Pantoprazole Sodium
24 claims
- Ursodiol 22
Ursodiol
22 claims
| Drug | Claims |
|---|---|
| Dexamethasone | 66 |
| Prochlorperazine Maleate | 57 |
| Ondansetron Odt Ondansetron | 36 |
| Loperamide Loperamide Hcl | 28 |
| Creon Lipase/Protease/Amylase | 25 |
| Omeprazole | 24 |
| Pantoprazole Sodium | 24 |
| Ursodiol | 22 |
| Eliquis Apixaban | 17 |
| Ondansetron Hcl | 15 |
* 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 Emerson Chen, MD fits within the Hematology & Oncology Physician landscape nationally.
11,530
Hematology & Oncology Physician Providers in US
54
States with Hematology & Oncology Physician
885
Avg Claims per Provider
Emerson Chen, MD's 584 claims are below the specialty average of 885.
Nationwide Hematology & Oncology Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Chen, both outside Oregon so the neighborhoods are not geographic containment.
Similar MIPS final score
Nearest same-specialty clinicians by CMS MIPS final score (97.8 here).
Same NPPES enumeration year (2013)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Hematology & Oncology Physician Providers in Oregon
Other clinicians with the same primary specialty enrolled in Oregon, drawn from the same CMS NPPES roster as Chen.
One of 140 Hematology & Oncology Physician providers enrolled in Oregon, 5 are shown here.
Dr. Gerald Ahmann
MD
Medford, OR
Dr. Jay Andersen
M.D.
Portland, OR
Dr. Molly Andreason
MD
Portland, OR
Dr. Pragathi Balakrishna
M.D.
Medford, OR
Dr. Christine Barnett
M.D.
Portland, OR
Compare Hematology & Oncology Physician nationally: see state-by-state distribution →
Frequently Asked Questions
What is Emerson Chen, MD's specialty? ▼
Emerson Chen, MD specializes in Hematology & Oncology Physician and practices in Portland, Oregon. Credentials: MD.
How much does Emerson Chen, MD prescribe under Medicare Part D? ▼
In 2024, Emerson Chen, MD wrote 584 Medicare Part D claims totaling $508K in drug costs for 64 beneficiaries.
What is Emerson Chen, MD's Medicare quality score? ▼
Emerson Chen, MD has a CMS MIPS Final Score of 97.8/100 (Quality: 81). The average MIPS Final Score across the 454,083 clinicians with at least one published category score is 83.5; clinicians whose score CMS assigned without scoring any category are excluded from that average. Source: CMS Merit-based Incentive Payment System (MIPS) 2023.
Where is Emerson Chen, MD located? ▼
Emerson Chen, MD is located at 3181 SW SAM JACKSON PARK RD, Portland, OR, 97239. Phone: (503) 494-4335.
What is Emerson Chen, MD's NPI number? ▼
Emerson Chen, MD's National Provider Identifier (NPI) is 1134564610, issued on 05/09/2013.
Does Emerson Chen, MD prescribe opioids? ▼
Yes, Emerson Chen, MD had 17 opioid claims in 2024 with an opioid prescribing rate of 2.9%.
How many Hematology & Oncology Physician providers are there in the US? ▼
There are 11,530 Hematology & Oncology Physician providers across 54 states in the US. The average Hematology & Oncology Physician provider writes 885 Medicare Part D claims per year.
What drugs does Emerson Chen, MD prescribe most often? ▼
Based on 2024 Medicare Part D data, Emerson Chen, MD's most frequently prescribed drugs include Dexamethasone, Prochlorperazine Maleate, Ondansetron Odt. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Emerson Chen, MD accept Medicare? ▼
Emerson Chen, MD appears in CMS Medicare data with 584 Part D claims and 64 Medicare beneficiaries in 2024. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Emerson Chen, MD's credentials? ▼
Emerson Chen, MD's NPI is 1134564610 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 (2024). 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 August 2026 (NPPES) / 2024 (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 August 2026.