NPI registry status
Active
2026 NPPES data Hematology (Internal Medicine) Physician NPI 1881739530 MD
Verify on CMS → Sally Arai, MD
Hematology (Internal Medicine) Physician in Stanford, 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 1,436 in Hematology (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
433
Medicare Part D claims · 48 beneficiaries · Hematology (Internal Medicine) Physician avg: 693
MIPS score
76.5/100
▼ 7 pts below national avg 83.1 · Above neutral
Industry payments
$1.9K
8 payments · CMS Open Payments (Sunshine Act)
Compiled from official public sources by the PlainDoctor editorial team.
What the federal data shows
Sally Arai, MD reported a CMS MIPS final score of 76.5/100 - below the 83.1 national average - and filed 433 Medicare Part D claims in 2023.
- 76.5/100
- MIPS score · -7 vs avg
- 433
- Part D claims, 2023
- 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.
Sally Arai, MD's MIPS score vs every scored U.S. clinician
CMS Merit-based Incentive Payment System (MIPS) final score, 2023, the federal quality measure
77 21st percentile higher than 21% 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 Sally Arai, MD sits
This provider among hematology (internal medicine) physician peers
Across the 570 hematology (internal medicine) physician providers who report both Medicare Part D prescribing and a MIPS quality score, Sally Arai, MD writes more Part D claims than 42% of them and scores higher on MIPS quality than 30% - placing this provider in the lower-volume, lower-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 hematology (internal medicine) physician peer from a representative sample of 60; the gold marker is Sally Arai, MD. Source: CMS Medicare Part D Prescriber data and the CMS Merit-based Incentive Payment System, 2023.
✓
Board certification likely (heuristic, not verified)
Sally Arai, 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 Sally Arai, MD?
Below national averagePrimary specialty
Hematology (Internal Medicine) Physician
Medicare Part D claims
433 38% vs specialty avg
MIPS final score
76.5/100 6.6 pts vs avg
Specialty distribution in California
How Hematology (Internal Medicine) Physician compares to other specialties among California providers
Medicare quality performance, MIPS
Sally Arai, MD's 2023 MIPS final score plotted against the Hematology (Internal Medicine) Physician national average
- MIPS Final Score
- 76.5/100
- vs 83.1 national avg · 2023 performance year
MIPS final score (Hematology (Internal Medicine) Physician) - 76.5/100 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).
Sally Arai, MD appears in the CMS NPPES registry as a Hematology (Internal Medicine) Physician provider holding MD credentials at 300 PASTEUR DR, Stanford, CA, 94305, with a listed phone of (650) 723-0822. NPI 1881739530 was issued on 02/20/2007.
Medicare Part D records for calendar year 2023 show 433 prescription claims written by this provider, covering 48 Medicare beneficiaries and totaling roughly $894K in drug spend. On the CMS Merit-based Incentive Payment System, this provider earned a Final Score of 76.5/100 for the 2023 performance year (Quality 74.3, Cost 44), compared with the national average of 83.1.
Hematology (Internal Medicine) Physician is a narrow specialty nationwide, with 1,436 enrolled providers across 50 states and an average of 693 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 | 1881739530 |
|---|---|
| Specialty | Hematology (Internal Medicine) Physician |
| Credentials | MD |
| Gender | Female |
| NPI Issued | 02/20/2007 |
CMS Quality Score (MIPS)
Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.
76.5025
Final Score
Avg: 83.1
74.3195
Quality
43.9595
Cost
100
Promoting Interoperability
Reporting: Group practice
Hospital and facility affiliations
Facilities where Sally Arai, 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.
Stanford Health Care
★★★★★ 5/5
Stanford, CA
Acute Care Hospitals
CMS CCN: 050441
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 Sally Arai, MD. Source: openpaymentsdata.cms.gov.
Total received
$1.9K
Largest payer
Incyte Corporation
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 Sally Arai, MD. To verify Sally Arai, 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.
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2023.
433
Total Claims
$894K
Total Drug Cost
48
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 636
- Total Day Supply
- 17,823
- Generic Drug Cost
- $54K
- Antibiotic Claims
- 68
Patient Demographics
- Average Patient Age
- 66.0 years
- Avg HCC Risk Score
- 3.85
- Gender Split
- 52% female / 48% male
- Age Distribution
- <65: 13, 65-74: 29, 75-84: N/A, 85+: N/A
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Sally Arai, MD prescribes most
Top Medicare Part D drugs by claim count, 2023
- Acyclovir
Acyclovir
67 claims
- Sulfamethoxazole-T…
Sulfamethoxazole-Trimethoprim
48 claims
- Prednisone
Prednisone
32 claims
- Atovaquone
Atovaquone
29 claims
- Jakafi 20
Jakafi
20 claims
- Posaconazole 19
Posaconazole
19 claims
- Rezurock 18
Rezurock
18 claims
- Risperidone 12
Risperidone
12 claims
| Drug | Claims |
|---|---|
| Acyclovir | 67 |
| Sulfamethoxazole-Trimethoprim Sulfamethoxazole/Trimethoprim | 48 |
| Prednisone | 32 |
| Atovaquone | 29 |
| Jakafi Ruxolitinib Phosphate | 20 |
| Posaconazole | 19 |
| Rezurock Belumosudil Mesylate | 18 |
| Risperidone | 12 |
| Eliquis Apixaban | 11 |
| Gabapentin | 11 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
More Hematology (Internal Medicine) Physician in CA →
All providers in California →
Compare specialties →
Hematology (Internal Medicine) Physician Overview
How Sally Arai, MD fits within the Hematology (Internal Medicine) Physician landscape nationally.
1,436
Hematology (Internal Medicine) Physician Providers in US
50
States with Hematology (Internal Medicine) Physician
693
Avg Claims per Provider
Sally Arai, MD's 433 claims are below the specialty average of 693.
Nearby Hematology (Internal Medicine) Physician Providers in California
Other clinicians with the same primary specialty enrolled in California, drawn from the same CMS NPPES roster as Arai.
Dr. Haifaa Abdulhaq
MD
Fresno, CA
Dr. John Adamson
MD
San Diego, CA
Dr. Idoroenyi Amanam
M.D.
Duarte, CA
Dr. Ian Anderson
M.D.
Santa Rosa, CA
Dr. Danielle Atibalentja
M.D., PH.D.
Stanford, CA
Compare Hematology (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 Hematology (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.
Healthcare Guides
Learn more about finding, verifying, and understanding healthcare providers.
How to Find a Doctor
Step-by-step guide to choosing a provider
Verify Credentials
Check NPI, board certification & license status
Medical Specialties Explained
Who treats what and how specialties differ
Understanding Medicare Claims Data
What prescribing data reveals about a provider
In-Network vs Out-of-Network
How insurance networks affect your costs
Telehealth Guide
Virtual care options and coverage in 2026
Explore California
Frequently Asked Questions
What is Sally Arai, MD's specialty? ▼
Sally Arai, MD specializes in Hematology (Internal Medicine) Physician and practices in Stanford, California. Credentials: MD.
How much does Sally Arai, MD prescribe under Medicare Part D? ▼
In 2023, Sally Arai, MD wrote 433 Medicare Part D claims totaling $894K in drug costs for 48 beneficiaries.
What is Sally Arai, MD's Medicare quality score? ▼
Sally Arai, MD has a CMS MIPS Final Score of 76.5/100 (Quality: 74.3, Cost: 44). The national average MIPS Final Score is 83.1. Source: CMS Merit-based Incentive Payment System (MIPS) 2023.
Where is Sally Arai, MD located? ▼
Sally Arai, MD is located at 300 PASTEUR DR, Stanford, CA, 94305. Phone: (650) 723-0822.
What is Sally Arai, MD's NPI number? ▼
Sally Arai, MD's National Provider Identifier (NPI) is 1881739530, issued on 02/20/2007.
How many Hematology (Internal Medicine) Physician providers are there in the US? ▼
There are 1,436 Hematology (Internal Medicine) Physician providers across 50 states in the US. The average Hematology (Internal Medicine) Physician provider writes 693 Medicare Part D claims per year.
What drugs does Sally Arai, MD prescribe most often? ▼
Based on 2023 Medicare Part D data, Sally Arai, MD's most frequently prescribed drugs include Acyclovir, Sulfamethoxazole-Trimethoprim, Prednisone. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Sally Arai, MD accept Medicare? ▼
Sally Arai, MD appears in CMS Medicare data with 433 Part D claims and 48 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Sally Arai, MD's credentials? ▼
Sally Arai, MD's NPI is 1881739530 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.
- 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.