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ICD-10/R10.A0

R10.A0 ICD-10-CM Code: Flank pain, unspecified side

R10.A0 is the authoritative medical code for Flank pain, unspecified side. This classification is used in medical billing and clinical recording to specify the clinical criteria for flank pain, unspecified side (ICD-10-CM R10.A0), ensuring healthcare documentation aligns with current federal coding standards.

Billing Status: YES. This is a valid, specific, and billable ICD-10-CM reference.

Inpatient Payment Groups (MS-DRG)

MS-DRGs this diagnosis helps define, as principal or secondary, per the CMS ICD-10-CM/PCS MS-DRG Definitions Manual v43.0 (FY2026), Appendix B.

  • MS-DRG 391 — ESOPHAGITIS, GASTROENTERITIS AND MISCELLANEOUS DIGESTIVE DISORDERS WITH MCC (MDC 06)
  • MS-DRG 392 — ESOPHAGITIS, GASTROENTERITIS AND MISCELLANEOUS DIGESTIVE DISORDERS WITHOUT MCC (MDC 06)

A diagnosis appearing in a group's logic does not by itself determine the DRG assigned to a stay; the grouper uses the full claim.

Code Set: Valid FY2026 and FY2027. FY2026 took effect October 1, 2025.

Official Registry Overview & Definition

Flank pain, unspecified side is a billable ICD-10-CM diagnosis code (R10.A0).

Official Tabular Instructional Notes

Sequencing, inclusion, and exclusion notes published for R10.A0 in the official ICD-10-CM tabular list.

Excludes1 — Not Coded Here

Conditions that can never be reported with this code; the two are mutually exclusive.

  • renal colic (N23)

Excludes2 — Not Included Here

Conditions not covered by this code, but which may be reported alongside it when both are present.

  • pain localized to other parts of lower abdomen (R10.3-)
  • pain localized to upper abdomen (R10.1-)
  • costovertebral (angle) tenderness (R39.85)
  • dorsalgia (M54.-)
  • flatulence and related conditions (R14.-)
  • congenital or infantile pylorospasm (Q40.0)
  • gastrointestinal hemorrhage (K92.0-K92.2)
  • intestinal obstruction (K56.-)
  • newborn gastrointestinal hemorrhage (P54.0-P54.3)
  • newborn intestinal obstruction (P76.-)
  • pylorospasm (K31.3)
  • signs and symptoms involving the urinary system (R30-R39)
  • symptoms referable to female genital organs (N94.-)
  • symptoms referable to male genital organs (N48-N50)

Nearest Codes in This Family

Official ICD-10-CM classifications closest to R10.A0 in its code family, with their registry titles.

  • R10.85 — Abdominal pain of multiple sites
  • R10.8A — Flank tenderness
  • R10.8A1 — Right flank tenderness
  • R10.8A2 — Left flank tenderness
  • R10.8A3 — Suprapubic tenderness
  • R10.8A9 — Flank tenderness, unspecified
  • R10.9 — Unspecified abdominal pain
  • R10.A — Pain localized to flank
  • R10.A1 — Flank pain, right side
  • R10.A2 — Flank pain, left side

View all codes in the R10 family

Indexed Clinical Terms (1)

Clinical term phrases from the official ICD-10-CM Index to Diseases and Injuries that map to this code.

  • Pain (s), flank