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ICD-10/Q55.21

Q55.21 ICD-10-CM Code: Polyorchism

Q55.21 is the authoritative medical code for Polyorchism. This classification is used in medical billing and clinical recording to specify the clinical criteria for polyorchism (ICD-10-CM Q55.21), 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 729 — OTHER MALE REPRODUCTIVE SYSTEM DIAGNOSES WITH CC/MCC (MDC 12)
  • MS-DRG 730 — OTHER MALE REPRODUCTIVE SYSTEM DIAGNOSES WITHOUT CC/MCC (MDC 12)

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

Polyorchism is a billable ICD-10-CM diagnosis code (Q55.21). Excludes1 (not coded here): congenital hydrocele (P83.5); hypospadias (Q54.-); androgen insensitivity syndrome (E34.5-); syndromes associated with anomalies in the number and form of chromosomes (Q90-Q99).

Official Tabular Instructional Notes

Sequencing, inclusion, and exclusion notes published for Q55.21 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.

  • congenital hydrocele (P83.5)
  • hypospadias (Q54.-)
  • androgen insensitivity syndrome (E34.5-)
  • syndromes associated with anomalies in the number and form of chromosomes (Q90-Q99)

Frequently Asked Questions (FAQ) & Clinical Guidance

What can't be coded together with Q55.21?

Per official ICD-10-CM Excludes1 instructions, Q55.21 must not be reported together with: congenital hydrocele (P83.5); hypospadias (Q54.-); androgen insensitivity syndrome (E34.5-); syndromes associated with anomalies in the number and form of chromosomes (Q90-Q99).

Nearest Codes in This Family

Official ICD-10-CM classifications closest to Q55.21 in its code family, with their registry titles.

  • Q55 — Other congenital malformations of male genital organs
  • Q55.0 — Absence and aplasia of testis
  • Q55.1 — Hypoplasia of testis and scrotum
  • Q55.2 — Other and unspecified congenital malformations of testis and scrotum
  • Q55.20 — Unspecified congenital malformations of testis and scrotum
  • Q55.22 — Retractile testis
  • Q55.23 — Scrotal transposition
  • Q55.29 — Other congenital malformations of testis and scrotum
  • Q55.3 — Atresia of vas deferens
  • Q55.4 — Other congenital malformations of vas deferens, epididymis, seminal vesicles and prostate

View all codes in the Q55 family

Indexed Clinical Terms (2)

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

  • Malformation (congenital), testis and scrotum, polyorchism
  • Polyorchism, polyorchidism