2026 ICD-10-CM Diagnosis Code N28.1Cyst of kidney, acquired

ICD-10-CM Codes›N00–N99›N25-N29›N28

ICD-10-CM N28.1
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

N28.1 is a billable ICD-10-CM diagnosis code for cyst of kidney, acquired. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 698 through 700. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified and unspecified diseases of kidney and ureters.

Code Identity

ICD-10-CM Code
N28.1
Billable Status
Yes — Valid for Submission
Code Describes
Cyst of kidney, acquired
Short Description
Cyst of kidney, acquired
Same as the full description in the CMS dataset.
Parent Code
N28
Other disorders of kidney and ureter, not elsewhere classified

Code Classification

ChapterN00–N99Diseases of the genitourinary system
SectionN25-N29Other disorders of kidney and ureter
CategoryN28Other disorders of kidney and ureter, not elsewhere classified
This CodeN28.1Cyst of kidney, acquired

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Acquired complex renal cyst
  • Acquired cystic disease associated renal cell carcinoma
  • Acquired cystic disease of transplanted kidney
  • Acquired polycystic kidney disease
  • Acquired renal cyst with neoplastic change
  • Acquired renal cyst without neoplastic change
  • Acquired renal cystic disease
  • Complex renal cyst
  • Cyst of kidney
  • Hydatid cyst of kidney
  • Infected renal cyst
  • Multiple acquired kidney cysts
  • Multiple renal cysts
  • Parapelvic renal cyst
  • Peripelvic cyst
  • Rupture of kidney
  • Ruptured cyst of kidney
  • Simple renal cyst
  • Single acquired kidney cyst

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Inclusion Terms

  • Cyst (multiple) (solitary) of kidney (acquired)

Type 1 Excludes

  • cystic kidney disease congenital Q61

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.

    • Cyst(colloid) (mucous) (simple) (retention)
      • kidney
    • Cyst(colloid) (mucous) (simple) (retention)
      • kidney
        • acquired
    • Cyst(colloid) (mucous) (simple) (retention)
      • kidney
        • simple
    • Cyst(colloid) (mucous) (simple) (retention)
      • kidney
        • solitary (single)
    • Cyst(colloid) (mucous) (simple) (retention)
      • kidney
        • solitary (single)
          • acquired
    • Cyst(colloid) (mucous) (simple) (retention)
      • paranephric
    • Cyst(colloid) (mucous) (simple) (retention)
      • peripelvic (lymphatic)
    • Cyst(colloid) (mucous) (simple) (retention)
      • solitary
        • kidney
    • Solitary
      • cyst, kidney

Clinical ClassificationClinical

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

CCSR GEN006
Other specified and unspecified diseases of kidney and ureters
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Kidney Cysts

A cyst is a fluid-filled sac. You may get simple kidney cysts as you age; they are usually harmless. There are also some diseases which cause kidney cysts. One type is polycystic kidney disease (PKD). It runs in families. In PKD, many cysts grow in the kidneys. This can enlarge the kidneys and make them work poorly.

Read the full article at MedlinePlus

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

Convert N28.1 to ICD-9-CMHistory

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

ICD-9-CM
593.2 Cyst of kidney, acquired
Exact Match The mapping is direct, with no qualifiers.

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 N28.1Overview

Is N28.1 a billable code?

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

What MS-DRG does N28.1 group to?

When cyst of kidney, acquired is the principal diagnosis on an inpatient stay, it groups to MS-DRG 698, 699, 700, with relative weights from 0.6899 to 1.6544 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of N28.1?

Under the General Equivalence Mappings, cyst of kidney, acquired converts to ICD-9-CM 593.2 (cyst of kidney, acquired). The mapping is a direct match.

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.