2027 ICD-10-CM Diagnosis Code Q93.59Other deletions of part of a chromosome

ICD-10-CM Codes›Q00-Q99›Q90-Q99›Q93

ICD-10-CM Q93.59
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

Q93.59 is a billable ICD-10-CM diagnosis code for other deletions of part of a chromosome. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 884. As a secondary diagnosis, it counts as a complication or comorbidity (CC) and moves an inpatient stay to a higher severity level within its MS-DRG family. It does not count, however, when the principal diagnosis is one of 68 closely related codes. The code is exempt from POA reporting. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Chromosomal abnormalities.

Q93.59 does not risk-adjust for Medicare Advantage under the CMS-HCC V28 model. It still risk-adjusts in the RxHCC Part D (V08) category 148 for payment year 2027.

Code Identity

ICD-10-CM Code
Q93.59
Billable Status
Yes — Valid for Submission
Code Describes
Other deletions of part of a chromosome
Short Description
Other deletions of part of a chromosome
Same as the full description in the CMS dataset.
Parent Code
Q93.5
Other deletions of part of a chromosome

Code Classification

ChapterQ00-Q99Congenital malformations, deformations and chromosomal abnormalities
SectionQ90-Q99Chromosomal abnormalities, not elsewhere classified
CategoryQ93Monosomies and deletions from the autosomes, not elsewhere classified
This CodeQ93.59Other deletions of part of a chromosome

Present on Admission (POA)Billing

Q93.59 is exempt from POA reporting on inpatient claims to general acute care hospitals. Review the other POA exempt codes in Chromosomal abnormalities, not elsewhere classified (Q90-Q99).

Medicare Risk Adjustment (HCC)Billing

Q93.59 does not risk-adjust for Medicare Advantage under the CMS-HCC V28 model, but it maps to payment categories in the other CMS models shown below.

CMS-HCC V28 (Medicare Advantage Payment Model)
Not mapped
no payment category in the model that pays 100% of MA risk scores
Prior Model (CMS-HCC V24)
Not mapped under V24
this diagnosis newly risk-adjusts under the V28 model
Part D (RxHCC)
RxHCC 148 — Mild or Unspecified Intellectual Disability/Developmental Disorder
also risk-adjusts in the Part D prescription drug model (V08)

Source: CMS Payment Year 2027 risk adjustment mappings and model software. Weights are relative factors, not dollar amounts; a beneficiary's total RAF also includes demographics and interactions. Browse all CMS-HCC categories.

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • 10p partial monosomy syndrome
  • 10q partial monosomy
  • 11p partial monosomy syndrome
  • 11p15 deletion syndrome
  • 11q partial monosomy syndrome
  • 12q15 deletion syndrome
  • 12q24.31-q24.32 deletion syndrome
  • 18q partial monosomy syndrome
  • 1p partial monosomy
  • 1q partial monosomy
  • 20p12.2 deletion syndrome
  • 21q partial monosomy syndrome
  • 22q partial monosomy
  • 22q13.3 deletion syndrome
  • 3p partial monosomy syndrome
  • 3q26q28 deletion syndrome
  • 4q partial monosomy syndrome
  • 6q terminal deletion syndrome
  • 7p partial monosomy
  • 7p12-p14 deletion syndrome
  • 7p21.1 deletion syndrome
  • 7q partial monosomy
  • 8p partial monosomy syndrome
  • 8q partial monosomy syndrome
  • 9p24.3 deletion syndrome
  • 9q partial monosomy syndrome
  • 9q34 deletion syndrome
  • Chromosome 16p11.2 deletion syndrome
  • Chromosome 2q37 deletion syndrome
  • Congenital exostosis
  • Deletion 5q35
  • Deletion of long arm of chromosome 13
  • Deletion of long arm of chromosome 18
  • Deletion of long arm of chromosome 19
  • Deletion of part of autosome
  • Deletion of part of chromosome 1
  • Deletion of part of chromosome 10
  • Deletion of part of chromosome 11
  • Deletion of part of chromosome 12
  • Deletion of part of chromosome 13
  • Deletion of part of chromosome 14
  • Deletion of part of chromosome 15
  • Deletion of part of chromosome 16
  • Deletion of part of chromosome 17
  • Deletion of part of chromosome 18
  • Deletion of part of chromosome 19
  • Deletion of part of chromosome 2
  • Deletion of part of chromosome 20
  • Deletion of part of chromosome 21
  • Deletion of part of chromosome 22
  • Deletion of part of chromosome 3
  • Deletion of part of chromosome 4
  • Deletion of part of chromosome 5
  • Deletion of part of chromosome 6
  • Deletion of part of chromosome 7
  • Deletion of part of chromosome 8
  • Deletion of part of chromosome 9
  • Deletion of part of long arm of chromosome 12
  • Deletion of part of long arm of chromosome 17
  • Deletion of part of long arm of chromosome 2
  • Deletion of part of long arm of chromosome 20
  • Deletion of part of long arm of chromosome 3
  • Deletion of part of long arm of chromosome 5
  • Deletion of part of long arm of chromosome 6
  • Deletion of part of short arm of chromosome 12
  • Deletion of part of short arm of chromosome 16
  • Deletion of part of short arm of chromosome 17
  • Deletion of part of short arm of chromosome 2
  • Deletion of part of short arm of chromosome 20
  • Deletion of part of short arm of chromosome 6
  • Deletion of short arm of chromosome 19
  • Distal chromosome 18q deletion syndrome
  • Distal deletion of chromosome 13
  • Distal deletion of chromosome 14
  • Distal deletion of chromosome 15
  • Distal deletion of chromosome 21
  • Distal deletion of long arm of chromosome 12
  • Distal deletion of long arm of chromosome 16
  • Distal deletion of long arm of chromosome 2
  • Distal deletion of long arm of chromosome 3
  • Distal deletion of long arm of chromosome 6
  • Distal deletion of long arm of chromosome 7
  • Distal deletion of long arm of chromosome 8
  • Distal deletion of long arm of chromosome 9
  • Distal deletion of short arm of chromosome 1
  • Distal deletion of short arm of chromosome 3
  • Distal deletion of short arm of chromosome 8
  • Distal monosomy 10p
  • Distal monosomy 10q syndrome
  • Distal monosomy 12p
  • Distal monosomy 13q syndrome
  • Distal monosomy 14q syndrome
  • Distal monosomy 15q
  • Distal monosomy 17q
  • Distal monosomy 19p13.3
  • Distal monosomy 3p syndrome
  • Distal monosomy 4q
  • Distal monosomy 6p
  • Distal monosomy 7p syndrome
  • Distal monosomy 7q36 syndrome
  • Distal monosomy 9p syndrome
  • Immunodeficiency associated with 18p syndrome
  • Medial deletion of chromosome 13
  • Medial deletion of chromosome 14
  • Medial deletion of long arm of chromosome 1
  • Medial deletion of long arm of chromosome 2
  • Medial deletion of long arm of chromosome 4
  • Medial deletion of long arm of chromosome 5
  • Medial deletion of long arm of chromosome 7
  • Medial deletion of long arm of chromosome 9
  • Medial deletion of short arm of chromosome 1
  • Monosomy 13q14 syndrome
  • Monosomy 13q34 syndrome
  • Monosomy 9p
  • Monosomy 9q22.3 syndrome
  • Non-distal monosomy 10q
  • Non-distal monosomy 12q
  • Partial deletion of long arm of chromosome 14
  • Partial deletion of long arm of chromosome 15
  • Partial deletion of long arm of chromosome 16
  • Potocki-Shaffer syndrome
  • Proximal 18q deletion syndrome
  • Proximal deletion of chromosome 13
  • Proximal deletion of chromosome 14
  • Proximal deletion of chromosome 15
  • Proximal deletion of chromosome 21
  • Proximal deletion of long arm of chromosome 1
  • Proximal deletion of long arm of chromosome 10
  • Proximal deletion of long arm of chromosome 11
  • Proximal deletion of long arm of chromosome 12
  • Proximal deletion of long arm of chromosome 16
  • Proximal deletion of long arm of chromosome 17
  • Proximal deletion of long arm of chromosome 2
  • Proximal deletion of long arm of chromosome 3
  • Proximal deletion of long arm of chromosome 4
  • Proximal deletion of long arm of chromosome 5
  • Proximal deletion of long arm of chromosome 6
  • Proximal deletion of long arm of chromosome 7
  • Proximal deletion of long arm of chromosome 8
  • Proximal deletion of long arm of chromosome 9
  • Proximal deletion of short arm of chromosome 1
  • Proximal deletion of short arm of chromosome 3
  • Proximal deletion of short arm of chromosome 6
  • Proximal deletion of short arm of chromosome 7
  • Proximal deletion of short arm of chromosome 8
  • Proximal deletion of short arm of chromosome 9

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to Q93.59: its own notes plus those printed at block Q90-Q99 and Chapter 17. A note printed at a category, block or chapter applies to every code under it.

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

From Block Q90-Q99 Chromosomal abnormalities, not elsewhere classified applies to 74 codes
  • mitochondrial metabolic disorders (E88.4-)
From Chapter 17 (Q00-QA1) Congenital malformations, deformations and chromosomal abnormalities applies to 900 codes
  • inborn errors of metabolism (E70-E88)

Notes

General instructions on how these codes are used.

From Chapter 17 (Q00-QA1) Congenital malformations, deformations and chromosomal abnormalities applies to 900 codes
  • Codes from this chapter are not for use on maternal records

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name Q93.59, its category, or a range that includes it.

Excludes1 3

These codes carry an Excludes1 note naming Q93.59: they are not reported together with it, unless the two conditions are unrelated.

  • E25 Adrenogenital disorders
    chromosomal abnormalities (Q90-Q99) names Q90-Q99, which includes this code
  • Block Q50-Q56 Congenital malformations of genital organs
    syndromes associated with anomalies in the number and form of chromosomes (Q90-Q99) names Q90-Q99, which includes this code
  • Z15 Genetic susceptibility to disease
    chromosomal anomalies (Q90-Q99) names Q90-Q99, which includes this code

Code First 1

These codes say to code first a condition named in the note, and Q93.59 is one of the conditions named.

  • D84.81 Immunodeficiency due to conditions classified elsewhere
    chromosomal abnormalities (Q90-Q99) names Q90-Q99, which includes this code

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

Clinical ClassificationClinical

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

CCSR MAL009
Chromosomal abnormalities
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Genetic Disorders

Genetic disorders are health conditions caused by changes (also called mutations or variants) in your genes. Genes are parts of DNA found in your cells that carry instructions for how your body grows, develops, and functions. Many genes tell your body how to make proteins, which are needed for your body to work properly.

The full article covers:

  • What are genetic disorders?
  • What causes genetic disorders?
  • What are the types of genetic disorders?
  • What are the different ways a genetic disorder can be inherited?
  • How are genetic disorders diagnosed?

Read the full article at MedlinePlus

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

Code History & ChangesHistory

Replacement Q93.59 replaces the following previously assigned code(s):

  • Q93.5 - Other deletions of part of a chromosome
FY 2019AddedAdded to the ICD-10-CM code setEffective October 1, 2018.
FY 2020–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About Q93.59Overview

What is the ICD-10 code for other deletions of part of a chromosome?

The ICD-10-CM code for other deletions of part of a chromosome is Q93.59 (sometimes written as Q9359). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is Q93.59 (Other deletions of part of a chromosome) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report other deletions of part of a chromosome on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What MS-DRG does Q93.59 group to?

When other deletions of part of a chromosome is the principal diagnosis on an inpatient stay, it groups to MS-DRG 884 (organic Disturbances and Intellectual Disability), which carries a relative weight of 1.5998. Higher weights mean higher Medicare reimbursement.

Is Q93.59 a CC or MCC?

CMS lists Q93.59 as a CC (complication or comorbidity) for FY 2027. Reported as a secondary diagnosis, it moves the inpatient stay to a higher-weighted DRG within its severity family. It does not count when the principal diagnosis is one of the 68 closely related codes in its exclusion list.

Is Q93.59 exempt from POA reporting?

Yes. CMS lists this code among those exempt from present on admission reporting, so hospitals do not assign a POA indicator for other deletions of part of a chromosome on inpatient claims. The code appears in the Chromosomal abnormalities, not elsewhere classified (Q90-Q99) range of the CMS exempt list.

Does Q93.59 risk-adjust for Medicare Advantage payment?

Not for Medicare Advantage: Q93.59 maps to no category in the CMS-HCC V28 model. It still risk-adjusts in the RxHCC Part D (V08) category 148 (Mild or Unspecified Intellectual Disability/Developmental Disorder).