NPI registry status
Active
2026 NPPES data Rheumatology Physician NPI 1770978835 M.D.
Verify on CMS → Erin Little, M.D.
Rheumatology Physician in Boston, Massachusetts.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 6,200 in Rheumatology 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
2K
Medicare Part D claims · 379 beneficiaries · Rheumatology Physician avg: 2K
Generic prescribing
78%
generic claims · 21% brand-name · higher generic rates reduce patient out-of-pocket costs
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
Erin Little, M.D. filed 1,873 Medicare Part D claims in 2023 as a Rheumatology Physician in Boston, Massachusetts, prescribing 78% generic.
- 2K
- 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.
Erin Little, M.D.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
1,873 Top 17% higher than 83% 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)
Erin Little, M.D. 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 Erin Little, M.D.?
Quality data not reportedPrimary specialty
Rheumatology Physician
Medicare Part D claims
1,873 9% vs specialty avg
Specialty distribution in Massachusetts
How Rheumatology Physician compares to other specialties among Massachusetts 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 Rheumatology 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).
Erin Little, M.D. appears in the CMS NPPES registry as a Rheumatology Physician provider holding M.D. credentials at 800 WASHINGTON ST, Boston, MA, 02111, with a listed phone of (617) 636-5990. NPI 1770978835 was issued on 04/05/2015.
Medicare Part D records for calendar year 2023 show 1,873 prescription claims written by this provider, covering 379 Medicare beneficiaries and totaling roughly $2.3 million in drug spend, split 21% brand-name and 78% generic by claim count, with an opioid prescribing rate of 1.8%.
Rheumatology Physician is a mid-sized specialty nationwide, with 6,200 enrolled providers across 52 states and an average of 2,054 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 | 1770978835 |
|---|---|
| Specialty | Rheumatology Physician |
| Credentials | M.D. |
| Gender | Female |
| NPI Issued | 04/05/2015 |
Hospital and facility affiliations
Facilities where Erin Little, 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.
Rhode Island Hospital
★★★★☆ 4/5
Pawtucket, RI
Acute Care Hospitals
CMS CCN: 410007
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 - Massachusetts BORIM 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 ~38K Massachusetts medical licensees in 2023 - they are NOT specific to Erin Little, M.D.. To verify Erin Little, M.D.'s current license status, search the BORIM public license lookup directly, or check the Federation of State Medical Boards (FSMB) verification service.
80
Total board actions, Massachusetts 2023
Across 78 cases
2.11
Actions per 1,000 licensees
Massachusetts statewide rate
probation
Most common action type
29 cases
BORIM 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 Massachusetts disciplinary trends page. Cross-checked against FSMB U.S. Medical Regulatory Trends.
Brand vs generic prescribing mix · Typical
Erin Little, M.D. - brand share 21.0%
Rheumatology Physician average
21% brand-name claims vs 78% generic, on 1,873 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.
1,873
Total Claims
$2.3M
Total Drug Cost
379
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 3,453
- Total Day Supply
- 99,848
- Brand vs Generic
- 21% brand / 78% generic
- Brand Drug Cost
- $2.3M
- Generic Drug Cost
- $51K
- Opioid Claims
- 34 (1.8% rate)
Patient Demographics
- Average Patient Age
- 70.5 years
- Avg HCC Risk Score
- 1.50
- Gender Split
- 74% female / 26% male
- Age Distribution
- <65: 75, 65-74: 157, 75-84: 122, 85+: 25
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Erin Little, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2023
- Prednisone
Prednisone
261 claims
- Methotrexate
Methotrexate
254 claims
- Hydroxychloroquine…
Hydroxychloroquine Sulfate
210 claims
- Allopurinol
Allopurinol
115 claims
- Alendronate Sodium
Alendronate Sodium
105 claims
- Humira(Cf) Pen 94
Humira(Cf) Pen
94 claims
- Sulfasalazine 56
Sulfasalazine
56 claims
- Colchicine 53
Colchicine
53 claims
| Drug | Claims |
|---|---|
| Prednisone | 261 |
| Methotrexate Methotrexate Sodium | 254 |
| Hydroxychloroquine Sulfate | 210 |
| Allopurinol | 115 |
| Alendronate Sodium | 105 |
| Humira(Cf) Pen Adalimumab | 94 |
| Sulfasalazine | 56 |
| Colchicine | 53 |
| Enbrel Sureclick Etanercept | 50 |
| Folic Acid | 46 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Rheumatology Physician Overview
How Erin Little, M.D. fits within the Rheumatology Physician landscape nationally.
6,200
Rheumatology Physician Providers in US
52
States with Rheumatology Physician
2,054
Avg Claims per Provider
Erin Little, M.D.'s 1,873 claims are below the specialty average of 2,054.
Nearby Rheumatology Physician Providers in Massachusetts
Other clinicians with the same primary specialty enrolled in Massachusetts, drawn from the same CMS NPPES roster as Little.
Dr. Maria Abruzzo
M.D.
Gardner, MA
Dr. Munir Ahmad
M.D.
Palmer, MA
Dr. Syed Ahmed
M.D.
Boston, MA
Dr. Ghousia Alikhan
M.D.
Holyoke, MA
Dr. Antonios Aliprantis
M.D.
Chestnut Hill, MA
Compare Rheumatology 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 Massachusetts medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Rheumatology 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 Massachusetts
Frequently Asked Questions
What is Erin Little, M.D.'s specialty? ▼
Erin Little, M.D. specializes in Rheumatology Physician and practices in Boston, Massachusetts. Credentials: M.D..
How much does Erin Little, M.D. prescribe under Medicare Part D? ▼
In 2023, Erin Little, M.D. wrote 1,873 Medicare Part D claims totaling $2.3M in drug costs for 379 beneficiaries.
Where is Erin Little, M.D. located? ▼
Erin Little, M.D. is located at 800 WASHINGTON ST, Boston, MA, 02111. Phone: (617) 636-5990.
What is Erin Little, M.D.'s NPI number? ▼
Erin Little, M.D.'s National Provider Identifier (NPI) is 1770978835, issued on 04/05/2015.
Does Erin Little, M.D. prescribe more brand-name or generic drugs? ▼
Erin Little, M.D.'s prescribing is 21% brand-name and 78% generic drugs by claim count, with $2.3M in brand drug costs.
Does Erin Little, M.D. prescribe opioids? ▼
Yes, Erin Little, M.D. had 34 opioid claims in 2023 with an opioid prescribing rate of 1.8%.
How many Rheumatology Physician providers are there in the US? ▼
There are 6,200 Rheumatology Physician providers across 52 states in the US. The average Rheumatology Physician provider writes 2,054 Medicare Part D claims per year.
What drugs does Erin Little, M.D. prescribe most often? ▼
Based on 2023 Medicare Part D data, Erin Little, M.D.'s most frequently prescribed drugs include Prednisone, Methotrexate, Hydroxychloroquine Sulfate. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Erin Little, M.D. accept Medicare? ▼
Erin Little, M.D. appears in CMS Medicare data with 1,873 Part D claims and 379 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Erin Little, M.D.'s credentials? ▼
Erin Little, M.D.'s NPI is 1770978835 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.
- 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.