NPI registry status
Active
2026 NPPES data Oncology Clinical Nurse Specialist NPI 1366768764 APN
Verify on CMS → Mary Welles, APN
Oncology Clinical Nurse Specialist in Chicago, Illinois.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 211 in Oncology Clinical Nurse Specialist, 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.
MIPS score
94.1/100
▲ 11 pts above national avg 83.5 · Exceptional
What the federal data shows
Mary Welles, APN reported a CMS MIPS final score of 94.1/100 - above the 83.5 national average.
- 94.1/100
- MIPS score · +11 vs avg
- ≥73rd
- 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.
CMS NPPES provider registry desk
NPI 1366768764 · Oncology Clinical Nurse Specialist
NPI-10 · ENUM-MID · TAX-TRACE · MIPS-ELITE · BOOK-THIN · PHOTO-FINISH
- NPI-10 1366768764
- ENUM-MID 2010
- TAX-TRACE 211
- MIPS-ELITE 94.1/100
- BOOK-THIN 25 in Illinois
- PHOTO-FINISH Mary Heery · ±0.1
MIPS final-score neighbourhood
Same-specialty nationwide peers by CMS final score, not geographic proximity
- Emily Connor · l…
Emily Connor
91.9 MIPS pts
- Janice Terlizzi …
Janice Terlizzi
92.9 MIPS pts
- Welles · this pr…
Welles · this provider
94.1 MIPS pts
- Mary Heery · near
Mary Heery
94.2 MIPS pts
- Kimberly Provenz…
Kimberly Provenzano
95.2 MIPS pts
What this shows Nearest measured MIPS peers for this NUCC specialty (2023 performance year).
Mary Welles, APN'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.
94 ≥ 73rd percentile 73% 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
What does the federal data show about Mary Welles, APN?
High performer (top quartile)Primary specialty
Oncology Clinical Nurse Specialist
MIPS final score
94.1/100 10.6 pts vs avg
Specialty distribution in Illinois
How Oncology Clinical Nurse Specialist compares to other specialties among Illinois providers
Medicare quality performance, MIPS
Mary Welles, APN's 2023 MIPS final score plotted against the Oncology Clinical Nurse Specialist national average
- MIPS Final Score
- 94.1/100
- 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 | 1366768764 |
|---|---|
| Specialty | Oncology Clinical Nurse Specialist |
| Credentials | APN |
| Gender | Female |
| NPI Issued | 04/12/2010 |
CMS Quality Score (MIPS)
Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.
94.1036
Final Score
Measured-score avg: 83.5
82.5938
Quality
100
Promoting Interoperability
Reporting: Alternative Payment Model
Hospital and facility affiliations
Facilities where Mary Welles, APN 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.
Northwestern Medical Faculty Foundation
Chicago, IL
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 - Illinois IDFPR 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 ~42K Illinois medical licensees in 2023 - they are NOT specific to Mary Welles, APN. To verify Mary Welles, APN's current license status, search the IDFPR public license lookup directly, or check the Federation of State Medical Boards (FSMB) verification service.
106
Total board actions, Illinois 2023
Across 103 cases
2.52
Actions per 1,000 licensees
Illinois statewide rate
probation
Most common action type
38 cases
IDFPR 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 Illinois disciplinary trends page. Cross-checked against FSMB U.S. Medical Regulatory Trends.
Oncology Clinical Nurse Specialist Overview
How Mary Welles, APN fits within the Oncology Clinical Nurse Specialist landscape nationally.
211
Oncology Clinical Nurse Specialist Providers in US
39
States with Oncology Clinical Nurse Specialist
435
Avg Claims per Provider
Nationwide Oncology Clinical Nurse Specialist peers with similar MIPS or enrollment year
Two federal-record peer sets for Welles, both outside Illinois so the neighborhoods are not geographic containment.
Similar MIPS final score
Nearest same-specialty clinicians by CMS MIPS final score (94.1 here).
Same NPPES enumeration year (2010)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Oncology Clinical Nurse Specialist Providers in Illinois
Other clinicians with the same primary specialty enrolled in Illinois, drawn from the same CMS NPPES roster as Welles.
One of 25 Oncology Clinical Nurse Specialist providers enrolled in Illinois, 5 are shown here.
Dr. Rosemarie Batiste
APN
Naperville, IL
Dr. Mary Brush
APN
Maywood, IL
Dr. Susan Budds
RN, MSN, APN
Naperville, IL
Dr. Mary Callaghan
APRN, CNS
Chicago, IL
Dr. Maryanne Fishman
R.N., M.S., A.O.C.N.
Chicago, IL
Compare Oncology Clinical Nurse Specialist nationally: see state-by-state distribution →
Frequently Asked Questions
What is Mary Welles, APN's specialty? ▼
Mary Welles, APN specializes in Oncology Clinical Nurse Specialist and practices in Chicago, Illinois. Credentials: APN.
What is Mary Welles, APN's Medicare quality score? ▼
Mary Welles, APN has a CMS MIPS Final Score of 94.1/100 (Quality: 82.6). 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 Mary Welles, APN located? ▼
Mary Welles, APN is located at 676 N SAINT CLAIR ST, Chicago, IL, 60611. Phone: (312) 926-5400.
What is Mary Welles, APN's NPI number? ▼
Mary Welles, APN's National Provider Identifier (NPI) is 1366768764, issued on 04/12/2010.
How many Oncology Clinical Nurse Specialist providers are there in the US? ▼
There are 211 Oncology Clinical Nurse Specialist providers across 39 states in the US. The average Oncology Clinical Nurse Specialist provider writes 435 Medicare Part D claims per year.
Does Mary Welles, APN accept Medicare? ▼
Mary Welles, APN appears in CMS Medicare data. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Mary Welles, APN's credentials? ▼
Mary Welles, APN's NPI is 1366768764 with credentials APN. 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.
- 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
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.