ICD-10-CM Code For Monosomies And Deletions From The Autosomes Not Elsewhere Classified: Group Overview

The International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) code group Q93 includes congenital monosomies and deletions of autosomal chromosomes not classified elsewhere, covering partial or complete loss of chromosomal material with variable phenotypic consequences. These ICD-10-CM diagnosis codes are used to document congenital chromosomal abnormalities that may present with developmental delay, structural malformations, or multisystem involvement and to capture the extent and specificity of genetic findings. Accurate coding within the ICD-10-CM Q93 group supports proper claim adjudication, complete clinical documentation, and appropriate reimbursement.

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ICD-10-CM Q93: Monosomies And Deletions From The Autosomes, Not Elsewhere Classified Overview

This group includes congenital chromosomal deletion and monosomy disorders affecting autosomes, often identified prenatally or at birth due to developmental anomalies. These conditions target genetic and developmental systems with variable multisystem involvement depending on the specific chromosomal deletion. Accurate coding matters for reimbursement because it links documented genetic findings to appropriate diagnostic and care pathways.

When to Use

Select a code from this group when a confirmed chromosomal monosomy or deletion of an autosome has been identified by cytogenetic or molecular testing and documented in the medical record. Use the most specific code available to reflect the affected chromosome and extent of deletion for accurate clinical documentation and billing.

ICD-10-CM Codes

14 rows

ICD-10-CM Code	Description
Q93.0	Whole chromosome monosomy, nonmosaicism (meiotic nondisjunction)
Q93.1	Whole chromosome monosomy, mosaicism (mitotic nondisjunction)
Q93.2	Chromosome replaced with ring, dicentric or isochromosome
Q93.3	Deletion of short arm of chromosome 4
Q93.4	Deletion of short arm of chromosome 5
Q93.51	Angelman syndrome
Q93.52	Phelan-McDermid syndrome
Q93.59	Other deletions of part of a chromosome
Q93.7	Deletions with other complex rearrangements
Q93.81	Velo-cardio-facial syndrome
Q93.82	Williams syndrome
Q93.88	Other microdeletions
Q93.89	Other deletions from the autosomes
Q93.9	Deletion from autosomes, unspecified

DRG Codes

2 rows

DRG Code	Description
884	Organic Disturbances and Intellectual Disability
951	Other Factors Influencing Health Status

Typical Clinical Scenarios

A newborn is delivered with multiple congenital anomalies discovered on initial physical exam and neonatal assessment, including dysmorphic facial features, limb malformations, and growth restriction. Genetic testing (microarray or karyotyping) confirms a partial monosomy of chromosome 5p consistent with a deletion syndrome, and the infant is referred to neonatology and genetics for further evaluation and supportive management. Typical codes: Q93.2.
An adult patient with a history of lifelong intellectual disability and short stature presents to primary care for routine management of chronic health issues and coordination of specialty care. Prior chromosomal analysis documents a constitutional deletion involving chromosome 4q leading to established developmental delays and congenital anomalies; the clinician documents this chromosomal abnormality as a comorbidity affecting care planning. Typical codes: Q93.1.
A pregnant woman undergoes prenatal ultrasound showing fetal structural anomalies; follow-up chorionic villus sampling identifies a fetal partial deletion of an autosome not involving sex chromosomes. The pregnancy is managed with maternal–fetal medicine consultation to assess prognosis and counsel on options, and the fetal chromosomal deletion is coded for prenatal diagnosis and counseling encounters. Typical codes: Q93.3, Q93.4.

Related Codes

Q90-DOWN-SYNDROME

ICD-10-CM Code For Down Syndrome: Group Overview

Q91-TRISOMY-18-AND-TRISOMY-13

ICD-10-CM Code For Trisomy 18 And Trisomy 13: Group Overview

Q92-OTHER-TRISOMIES-AND-PARTIAL-TRISOMIES

ICD-10-CM Code For Other Trisomies And Partial Trisomies Of The Autosomes Not Elsewhere Classified: Group Overview

Q95-BALANCED-REARRANGEMENTS-AND-STRUCTURAL-MARKERS

ICD-10-CM Code For Balanced Rearrangements And Structural Markers Not Elsewhere Classified: Group Overview

Q96-TURNERS-SYNDROME

ICD-10-CM Code For Turner's Syndrome: Group Overview

Q97-OTHER-SEX-CHROMOSOME-ABNORMALITIES-FEMALE-PHENOTYPE

ICD-10-CM Code For Other Sex Chromosome Abnormalities Female Phenotype Not Elsewhere Classified: Group Overview

Q98-OTHER-SEX-CHROMOSOME-ABNORMALITIES-MALE-PHENOTYPE

ICD-10-CM Code For Other Sex Chromosome Abnormalities Male Phenotype Not Elsewhere Classified: Group Overview

Q99-OTHER-CHROMOSOME-ABNORMALITIES-NOT-ELSEWHERE-CLASSIFIED

ICD-10-CM Code For Other Chromosome Abnormalities, Not Elsewhere Classified: Group Overview

Frequently Asked Questions

References

1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.

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When to Use

ICD-10-CM Codes

14 rows

ICD-10-CM Code	Description
Q93.0	Whole chromosome monosomy, nonmosaicism (meiotic nondisjunction)
Q93.1	Whole chromosome monosomy, mosaicism (mitotic nondisjunction)
Q93.2	Chromosome replaced with ring, dicentric or isochromosome
Q93.3	Deletion of short arm of chromosome 4
Q93.4	Deletion of short arm of chromosome 5
Q93.51	Angelman syndrome
Q93.52	Phelan-McDermid syndrome
Q93.59	Other deletions of part of a chromosome
Q93.7	Deletions with other complex rearrangements
Q93.81	Velo-cardio-facial syndrome
Q93.82	Williams syndrome
Q93.88	Other microdeletions
Q93.89	Other deletions from the autosomes
Q93.9	Deletion from autosomes, unspecified

DRG Codes

2 rows

DRG Code	Description
884	Organic Disturbances and Intellectual Disability
951	Other Factors Influencing Health Status

Typical Clinical Scenarios

A newborn is delivered with multiple congenital anomalies discovered on initial physical exam and neonatal assessment, including dysmorphic facial features, limb malformations, and growth restriction. Genetic testing (microarray or karyotyping) confirms a partial monosomy of chromosome 5p consistent with a deletion syndrome, and the infant is referred to neonatology and genetics for further evaluation and supportive management. Typical codes: Q93.2.
An adult patient with a history of lifelong intellectual disability and short stature presents to primary care for routine management of chronic health issues and coordination of specialty care. Prior chromosomal analysis documents a constitutional deletion involving chromosome 4q leading to established developmental delays and congenital anomalies; the clinician documents this chromosomal abnormality as a comorbidity affecting care planning. Typical codes: Q93.1.
A pregnant woman undergoes prenatal ultrasound showing fetal structural anomalies; follow-up chorionic villus sampling identifies a fetal partial deletion of an autosome not involving sex chromosomes. The pregnancy is managed with maternal–fetal medicine consultation to assess prognosis and counsel on options, and the fetal chromosomal deletion is coded for prenatal diagnosis and counseling encounters. Typical codes: Q93.3, Q93.4.

Related Codes

Q90-DOWN-SYNDROME

ICD-10-CM Code For Down Syndrome: Group Overview

Q91-TRISOMY-18-AND-TRISOMY-13

ICD-10-CM Code For Trisomy 18 And Trisomy 13: Group Overview

Q92-OTHER-TRISOMIES-AND-PARTIAL-TRISOMIES

ICD-10-CM Code For Other Trisomies And Partial Trisomies Of The Autosomes Not Elsewhere Classified: Group Overview

Q95-BALANCED-REARRANGEMENTS-AND-STRUCTURAL-MARKERS

ICD-10-CM Code For Balanced Rearrangements And Structural Markers Not Elsewhere Classified: Group Overview

Q96-TURNERS-SYNDROME

ICD-10-CM Code For Turner's Syndrome: Group Overview

Q97-OTHER-SEX-CHROMOSOME-ABNORMALITIES-FEMALE-PHENOTYPE

ICD-10-CM Code For Other Sex Chromosome Abnormalities Female Phenotype Not Elsewhere Classified: Group Overview

Q98-OTHER-SEX-CHROMOSOME-ABNORMALITIES-MALE-PHENOTYPE

ICD-10-CM Code For Other Sex Chromosome Abnormalities Male Phenotype Not Elsewhere Classified: Group Overview

Q99-OTHER-CHROMOSOME-ABNORMALITIES-NOT-ELSEWHERE-CLASSIFIED

ICD-10-CM Code For Other Chromosome Abnormalities, Not Elsewhere Classified: Group Overview

Frequently Asked Questions

References

1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.

Published by

Trek Health powers OpenPayer with a leading commercial payer intelligence platform, seamlessly converting fragmented payer data into actionable insights for provider organizations.

ICD-10-CM Code For Monosomies And Deletions From The Autosomes Not Elsewhere Classified: Group Overview

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ICD-10-CM Q93: Monosomies And Deletions From The Autosomes, Not Elsewhere Classified Overview

ICD-10-CM Code For Monosomies And Deletions From The Autosomes Not Elsewhere Classified: Group Overview

Sign up for ICD-10-CM Code For Monosomies And Deletions From The Autosomes Not Elsewhere Classified: Group Overview policy alerts

ICD-10-CM Q93: Monosomies And Deletions From The Autosomes, Not Elsewhere Classified Overview

When to Use

ICD-10-CM Codes

DRG Codes

Typical Clinical Scenarios

Related Codes

Which conditions are included in ICD-10-CM code group `Q93`?

How should coders document specificity when assigning a `Q93` code?

Which ICD-10-CM codes in `Q93` correspond to named syndromes?

What clinical presentations are associated with diagnoses in `Q93`?

Which related DRGs might be relevant for claims with `Q93` diagnoses?

References

When to Use

ICD-10-CM Codes

DRG Codes

Typical Clinical Scenarios

Related Codes

Which conditions are included in ICD-10-CM code group `Q93`?

How should coders document specificity when assigning a `Q93` code?

Which ICD-10-CM codes in `Q93` correspond to named syndromes?

What clinical presentations are associated with diagnoses in `Q93`?

Which related DRGs might be relevant for claims with `Q93` diagnoses?

References