2026 ICD-10-CM Diagnosis Code L70.1Acne conglobata

ICD-10-CM Codes›L00–L99›L60-L75›L70

ICD-10-CM L70.1
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

L70.1 is a billable ICD-10-CM diagnosis code for acne conglobata. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 606 through 607. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified inflammatory condition of skin.

Code Identity

ICD-10-CM Code
L70.1
Billable Status
Yes — Valid for Submission
Code Describes
Acne conglobata
Short Description
Acne conglobata
Same as the full description in the CMS dataset.
Parent Code
L70
Acne

Code Classification

ChapterL00–L99Diseases of the skin and subcutaneous tissue
SectionL60-L75Disorders of skin appendages
CategoryL70Acne
This CodeL70.1Acne conglobata

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Acne conglobata
  • Acne fulminans
  • Acne fulminans with erythema nodosum
  • Acne nodule
  • Cystic acne
  • Follicular occlusion tetrad - hidradenitis, acne conglobata, dissecting cellulitis, pilonidal sinus
  • Follicular occlusion triad - hidradenitis, acne conglobata, dissecting cellulitis of scalp
  • Nodulocystic acne

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Acne
      • conglobata

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR SKN002
Other specified inflammatory condition of skin
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Acne Conglobata

    severe and chronic form of acne characterized by large, burrowing abscesses associated with disfigurement.

  • Hidradenitis Suppurativa

    a chronic, suppurative inflammation of the apocrine sweat glands, that is characterized by clusters of bumps or sores.

Patient EducationClinical

Acne

Acne is a common skin disease that causes pimples. Pimples form when hair follicles under your skin clog up. Most pimples form on the face, neck, back, chest, and shoulders. Anyone can get acne, but it is common in teenagers and young adults. It is not serious, but it can cause scars.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert L70.1 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
706.1 Acne NEC
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About L70.1Overview

Is L70.1 (Acne) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report acne conglobata on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does L70.1 group to?

When acne conglobata is the principal diagnosis on an inpatient stay, it groups to MS-DRG 606, 607, with relative weights from 0.9064 to 1.5132 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of L70.1?

Under the General Equivalence Mappings, acne conglobata converts to ICD-9-CM 706.1 (acne NEC). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.