2027 ICD-10-CM Diagnosis Code Q06.2Diastematomyelia
ICD-10-CM Codes›Q00-Q99›Q00-Q07›Q06
- Billable — Valid for Submission
- Risk Adjusts — HCC 182
- POA Exempt
- Chronic Condition
Q06.2 is a billable ICD-10-CM diagnosis code for diastematomyelia. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 91 through 93, 791, 793. The code is exempt from POA reporting. Coders also document this condition as abnormality of canalization and retrogressive differentiation. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Nervous system congenital anomalies.
For Medicare Advantage risk adjustment, Q06.2 maps to CMS-HCC Category 182 (Spinal Cord Disorders/Injuries) under the V28 model, adding a risk factor of about 0.478 for a community, non-dual, aged beneficiary in payment year 2027.
Code Identity
Code Classification
Present on Admission (POA)Billing
Q06.2 is exempt from POA reporting on inpatient claims to general acute care hospitals. Review the other POA exempt codes in Congenital malformations of the nervous system (Q00-Q07).
Medicare Risk Adjustment (HCC)Billing
Q06.2 maps to a payment category in the CMS-HCC model used to risk-adjust Medicare Advantage payments. Weights are the published community factors for payment year 2027.
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.
- Abnormality of canalization and retrogressive differentiation
- Diplomyelia
- Faun tail syndrome
- Occult spinal dysraphism sequence
- Split cord malformation
- Split spinal cord malformation composite type
- Split spinal cord malformation type I
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to Q06.2: its own notes plus those printed at 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.
Notes
General instructions on how these codes are used.
- Codes from this chapter are not for use on maternal records
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
Diastematomyelia Q06.2
Duplication, duplex See Also: Accessory;
spinal cord (incomplete) Q06.2
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
Diastematomyelia
a rare congenital abnormality in which the spinal cord is split in half by fibrous or bony tissue. it may present as an isolated phenomenon or in association with spina bifida.
Patient EducationClinical
Neural Tube Defects
Neural tube defects are birth defects of the brain, spine, or spinal cord. They happen in the first month of pregnancy, often before a woman even knows that she is pregnant. The two most common neural tube defects are spina bifida and anencephaly. In spina bifida, the fetal spinal column doesn't close completely.
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert Q06.2 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About Q06.2Overview
What is the ICD-10 code for diastematomyelia?
The ICD-10-CM code for diastematomyelia is Q06.2 (sometimes written as Q062). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is Q06.2 (Other congenital malformations of spinal cord) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report diastematomyelia on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does Q06.2 group to?
When diastematomyelia is the principal diagnosis on an inpatient stay, it groups to MS-DRG 793, 791, 91, 92, 93, with relative weights from 0.7783 to 4.2192 depending on complications. Higher weights mean higher Medicare reimbursement.
Is Q06.2 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 diastematomyelia on inpatient claims. The code appears in the Congenital malformations of the nervous system (Q00-Q07) range of the CMS exempt list.
What is the ICD-9 equivalent of Q06.2?
Under the General Equivalence Mappings, diastematomyelia converts to ICD-9-CM 742.51 (diastematomyelia). The mapping is a direct match.
What HCC is Q06.2?
Q06.2 (diastematomyelia) maps to CMS-HCC Category 182 (Spinal Cord Disorders/Injuries), commonly written as HCC 182, in the CMS-HCC V28 model used for Medicare Advantage risk adjustment in payment year 2027. It mapped to HCC 72 under the retired V24 model. It also maps in the PACE (CMS-HCC V22), ESRD (V21), and ESRD (V24) models. In the Part D prescription drug model it maps to RxHCC 155.
Does Q06.2 risk-adjust for Medicare Advantage payment?
Yes. When documented and reported on a Medicare Advantage encounter, Q06.2 adds a risk adjustment factor of about 0.478 to the beneficiary's RAF score for a community, non-dual, aged enrollee (published V28 weights range from 0.270 to 0.478 depending on the payment segment). A more severe related category (HCC 180, HCC 181, HCC 191, and HCC 192) supersedes it when both are reported. See the full factor table on the HCC 182 category page.
