2026 NPPES data Clinical Social Worker NPI 1275603375 ACSW LCSW BOARD CERT
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LOUIS LESSOR, ACSW LCSW BOARD CERT

Clinical Social Worker in OAK PARK, Illinois. CMS National Plan and Provider Enumeration System profile including specialty classification, practice address, and Medicare prescribing data when reported.

Federal data — no proprietary rating. PlainDoctor publishes the actual CMS NPPES and Medicare records — NPI registration, specialty, practice location, and prescribing data — without a composite score or editorial opinion on top. Every field traces to a federal source.

What the federal data shows

LOUIS LESSOR, ACSW LCSW BOARD CERT is a Clinical Social Worker in OAK PARK, Illinois, listed in the federal CMS National Provider Identifier registry.

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.

What does the federal data show about LOUIS LESSOR, ACSW LCSW BOARD CERT?

Quality data not reported

NPI registry status

Active

Issued 11/08/2006

NPI 1275603375

Primary specialty

Clinical Social Worker

High-volume

272,898 US NPIs in this specialty

Specialty distribution in Illinois

How Clinical Social Worker compares to other specialties among Illinois providers

Illinois providers

Clinical Social Worker share within Illinois

1. Clinical Social Worker42%2. Internal medicine21%3. Family medicine17%4. Surgical12%5. Pediatric8%
Clinical Social Worker share within Illinois

Specialty board-certification context

Estimated specialty board-certified rate — Clinical Social Worker (ABMS / AOA reference)

Quality data not reported
Est. board-certified rate
78%
Clinical Social Worker ABMS/AOA estimate

Est. board-certified rate (Clinical Social Worker) — ABMS / AOA estimate

0%100%78%
Est. board-certified rate (Clinical Social Worker) — ABMS / AOA estimate

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).

LOUIS LESSOR, ACSW LCSW BOARD CERT appears in the CMS NPPES registry as a Clinical Social Worker provider holding ACSW LCSW BOARD CERT credentials at 315 SO EAST AVE, OAK PARK, IL, 60302, with a listed phone of (708) 848-5652. NPI 1275603375 was issued on 11/08/2006. Because NPPES data is self-reported by the provider and refreshed monthly, the address, phone, and specialty reflect what LESSOR most recently submitted to CMS rather than a vetted directory listing, which is why patients should always confirm the practice is still at this location before scheduling.

Medicare Part D prescribing data is not currently published for this NPI, which typically means the provider either wrote fewer than 11 Part D claims in the most recent reporting year, does not participate in Medicare, or practices in a specialty that rarely prescribes outpatient drugs. Absence of prescribing data is not a quality signal — many Clinical Social Worker providers operate outside Part D entirely.

Clinical Social Worker is a high-volume specialty nationwide, with 272,898 enrolled providers across 56 states and an average of 716 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

315 SO EAST AVE
OAK PARK, IL 60302

Provider Details

NPI 1275603375
Specialty Clinical Social Worker
Credentials ACSW LCSW BOARD CERT
Gender Male
NPI Issued 11/08/2006

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 LOUIS LESSOR, ACSW LCSW BOARD CERT. To verify LOUIS LESSOR, ACSW LCSW BOARD CERT'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.

Clinical Social Worker Overview

How LOUIS LESSOR, ACSW LCSW BOARD CERT fits within the Clinical Social Worker landscape nationally.

272,898
Clinical Social Worker Providers in US
56
States with Clinical Social Worker
716
Avg Claims per Provider

Nearby Clinical Social Worker Providers in Illinois

Other clinicians with the same primary specialty enrolled in Illinois, drawn from the same CMS NPPES roster as LESSOR.

Compare Clinical Social Worker nationally: see state-by-state distribution →

Frequently Asked Questions

What is LOUIS LESSOR, ACSW LCSW BOARD CERT's specialty?
LOUIS LESSOR, ACSW LCSW BOARD CERT specializes in Clinical Social Worker and practices in OAK PARK, Illinois. Credentials: ACSW LCSW BOARD CERT.
Where is LOUIS LESSOR, ACSW LCSW BOARD CERT located?
LOUIS LESSOR, ACSW LCSW BOARD CERT is located at 315 SO EAST AVE, OAK PARK, IL, 60302. Phone: (708) 848-5652.
What is LOUIS LESSOR, ACSW LCSW BOARD CERT's NPI number?
LOUIS LESSOR, ACSW LCSW BOARD CERT's National Provider Identifier (NPI) is 1275603375, issued on 11/08/2006.
How many Clinical Social Worker providers are there in the US?
There are 272,898 Clinical Social Worker providers across 56 states in the US. The average Clinical Social Worker provider writes 716 Medicare Part D claims per year.
Does LOUIS LESSOR, ACSW LCSW BOARD CERT accept Medicare?
LOUIS LESSOR, ACSW LCSW BOARD CERT appears in CMS Medicare data. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify LOUIS LESSOR, ACSW LCSW BOARD CERT's credentials?
LOUIS LESSOR, ACSW LCSW BOARD CERT's NPI is 1275603375 with credentials ACSW LCSW BOARD CERT. 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

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.
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