2027 ICD-10-CM Diagnosis Code G95.0Syringomyelia and syringobulbia

ICD-10-CM Codes›G00–G99›G89-G99›G95

ICD-10-CM G95.0
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

G95.0 is a billable ICD-10-CM diagnosis code for syringomyelia and syringobulbia. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 56 through 57. 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 136 closely related codes. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other nervous system disorders (neither hereditary nor degenerative).

For Medicare Advantage risk adjustment, G95.0 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

ICD-10-CM Code
G95.0
Billable Status
Yes — Valid for Submission
Code Describes
Syringomyelia and syringobulbia
Short Description
Syringomyelia and syringobulbia
Same as the full description in the CMS dataset.
Parent Code
G95
Other and unspecified diseases of spinal cord

Code Classification

ChapterG00–G99Diseases of the nervous system
SectionG89-G99Other disorders of the nervous system
CategoryG95Other and unspecified diseases of spinal cord
This CodeG95.0Syringomyelia and syringobulbia

Medicare Risk Adjustment (HCC)Billing

G95.0 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.

CMS-HCC V28 Category (Payment Model)
HCC 182— Spinal Cord Disorders/Injuries
Payment HCC · PY 2027 one of 251 ICD-10-CM codes in this category
Risk Adjustment Factor (RAF) Weight
+0.478
community, non-dual, aged · ranges 0.270–0.478 across segments
Hierarchy
Superseded by HCC 180, HCC 181, HCC 191, and HCC 192
a more severe related category takes the payment when both are reported
Prior Model (CMS-HCC V24)
HCC 72
V24 retired V28 pays 100% of MA risk scores since PY 2026
Other CMS Models
PACE (CMS-HCC V22): HCC 72 · ESRD (V21): HCC 72 · ESRD (V24): HCC 72
ESRD V21 weights: 0.102 dialysis, 0.256–0.456 functioning graft · ESRD V24 weights: 0.099 dialysis, 0.222–0.523 functioning graft
Part D (RxHCC)
RxHCC 155 — Spinal Cord Disorders
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.

  • Arthropathy associated with syringomyelia
  • Central cord syndrome due to syringomyelia
  • Charcot arthropathy due to syringomyelia
  • Congenital syringomyelia
  • Idiopathic syringomyelia
  • Post-traumatic syrinx
  • Secondary syringomyelia
  • Syringobulbia
  • Syringoencephalia
  • Syringomyelia
  • Syringomyelia and syringobulbia
  • Syringopontia

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to G95.0: its own notes plus those printed at G95 and Chapter 6. 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 G95 Other and unspecified diseases of spinal cord applies to 8 codes
From Chapter 6 (G00-G99) Diseases of the nervous system applies to 700 codes
  • certain conditions originating in the perinatal period (P04-P96)
  • certain infectious and parasitic diseases (A00-B99)
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)
  • congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • injury, poisoning and certain other consequences of external causes (S00-T88)
  • neoplasms (C00-D49)
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)

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

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name G95.0, its category, or a range that includes it.

Excludes1 2

These codes carry an Excludes1 note naming G95.0: they are not reported together with it, unless the two conditions are unrelated.

  • G98.0 Neurogenic arthritis, not elsewhere classified
    syringomyelia and syringobulbia (G95.0)
  • M49 Spondylopathies in diseases classified elsewhere
    neuropathic spondylopathy in syringomyelia (G95.0)

Code Also 1

These codes say G95.0 may also be needed to fully describe the condition. The note gives no sequencing direction.

  • G96.81 Intracranial hypotension
    Syringomyelia (G95.0)

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 NVS020
Other nervous system disorders (neither hereditary nor degenerative)
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Syringomyelia

    longitudinal cavities in the spinal cord, most often in the cervical region, which may extend for multiple spinal levels. the cavities are lined by dense, gliogenous tissue and may be associated with spinal cord neoplasms; spinal cord traumatic injuries; and vascular malformations. syringomyelia is marked clinically by pain and paresthesia, muscular atrophy of the hands, and analgesia with thermoanesthesia of the hands and arms, but with the tactile sense preserved (sensory dissociation). lower extremity spasticity and incontinence may also develop. (from adams et al., principles of neurology, 6th ed, p1269)

Patient EducationClinical

Syringomyelia

Syringomyelia is a rare disorder that causes a cyst to form in your spinal cord. This cyst, called a syrinx, gets bigger and longer over time, destroying part of the spinal cord. Damage to the spinal cord from the syrinx can cause symptoms such as :

Read the full article at MedlinePlus

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

Convert G95.0 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
336.0 Syringomyelia
Exact Match The mapping is direct, with no qualifiers.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About G95.0Overview

What is the ICD-10 code for syringomyelia and syringobulbia?

The ICD-10-CM code for syringomyelia and syringobulbia is G95.0 (sometimes written as G950). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is G95.0 (Other and unspecified diseases of spinal cord) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report syringomyelia and syringobulbia on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What MS-DRG does G95.0 group to?

When syringomyelia and syringobulbia is the principal diagnosis on an inpatient stay, it groups to MS-DRG 57, 56, with relative weights from 1.2835 to 2.2649 depending on complications. Higher weights mean higher Medicare reimbursement.

Is G95.0 a CC or MCC?

CMS lists G95.0 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 136 closely related codes in its exclusion list.

What is the ICD-9 equivalent of G95.0?

Under the General Equivalence Mappings, syringomyelia and syringobulbia converts to ICD-9-CM 336.0 (syringomyelia). The mapping is a direct match.

What HCC is G95.0?

G95.0 (syringomyelia and syringobulbia) 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 G95.0 risk-adjust for Medicare Advantage payment?

Yes. When documented and reported on a Medicare Advantage encounter, G95.0 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.