ICD-10-CM · Spine

M50.91

Unspecified cervical disc disorder localized to the high cervical (occipito-atlanto-axial, C1–C2) region, where the disc pathology type has not been documented with enough specificity to assign a more precise code.

Verified May 8, 2026 · 7 sources ↓

Status: Billable
Chapter: 13
Related CPT: 16
Region: Spine

Drawn from CDCICD10DataAAPCOutsourcestrategiesCMS

Documentation tips

What should appear in the chart to support M50.91.

Source · Editorial brief grounded in 7 cited references ↓

Provider must document the cervical level (C1–C2 or occipito-atlanto-axial region) explicitly — 'high cervical' in the note maps to the '1' 5th character.
If imaging (MRI, CT, or X-ray) is ordered, document the radiologic findings (disc herniation, degeneration, signal change, cord compression) so a more specific M50.x1 code can be assigned if supported.
Query the provider if the note references neck pain with a disc finding but does not characterize the pathology — radiculopathy, myelopathy, displacement, and degeneration each have dedicated codes that are preferred over M50.91.
Document symptom laterality and neurologic findings (upper extremity weakness, sensory changes, reflex changes) to support specificity and medical necessity for any ordered imaging or procedures.
Record prior conservative treatment history (physical therapy, NSAIDs, injections) in the assessment/plan when supporting surgical or interventional procedure authorization.

Related CPT procedures

Procedure codes commonly billed with M50.91. Linking the right diagnosis to the right procedure is what establishes medical necessity.

Source · CMS LCDs · AAOS specialty guidance · claims-pattern analysis

72040 $39.75

Radiologic examination of the cervical spine capturing two or three views (e.g., AP, lateral, oblique).

72050 $55.11

Radiologic examination of the cervical spine capturing a minimum of four views, used to evaluate alignment, fractures, degeneration, or other structural pathology of the neck.

72052 $62.79

Radiologic examination of the cervical spine using six or more distinct views, the highest-level plain-film cervical series in the CPT spine imaging family.

72141 $190.72

MRI of the cervical spinal canal and its contents performed without contrast material.

99213 $95.19

Established patient office or outpatient visit requiring 20–29 minutes of total time or low-complexity medical decision-making.

99214 $135.61

Office visit for an established patient requiring moderate-complexity medical decision making (MDM), or 30–39 minutes of total provider time on the date of service.

99215 $192.39

Highest-level office or outpatient E/M visit for an established patient, qualifying via high-complexity medical decision making or 40–54 minutes of total provider time on the date of service.

22551 $1,604.91

Anterior cervical discectomy and fusion (ACDF) at a single interspace, performed through a front-of-neck approach with removal of disc material and arthrodesis of adjacent vertebral bodies.

22554 $1,215.79

Anterior interbody arthrodesis of the cervical spine below C2, performed via anterior approach with minimal diskectomy to prepare the interspace for fusion — not performed for decompression purposes.

63020 $1,064.15

Laminotomy at a single cervical interspace with nerve root decompression, including partial facetectomy, foraminotomy, and/or herniated disc excision — open or endoscopic approach.

97110 $29.06

Therapeutic exercise billed per 15-minute unit, targeting strength, endurance, range of motion, or flexibility with direct one-on-one patient contact.

72142 View procedure details

72156 View procedure details

62321 View procedure details

62322 View procedure details

97530 View procedure details

Common coding pitfalls

The recurring mistakes coders make with M50.91 and adjacent codes.

Source · Editorial brief grounded in CDC ICD-10-CM tabular guidance, AAOS coding references, and cited references ↓

Defaulting to M50.91 when the note actually supports a specific disorder type — always check for documented myelopathy (M50.01), radiculopathy (M50.11), displacement (M50.21), or degeneration (M50.31) before assigning the unspecified code.
Confusing 'high cervical' (C1–C2, 5th character '1') with 'mid-cervical' (C3–C7, 5th character '2') — confirm the documented or imaged level before code selection.
Using M50.91 when the region is also unspecified — if neither the disc type nor the region is documented, the correct code is M50.90, not M50.91.
Assigning M50.91 for cervicothoracic disc pathology — if the disc disorder is at the C7–T1 junction, use M50.93.
Overlooking the M50 category includes note: cervicothoracic disc disorders with cervicalgia and cervicothoracic disc disorders are included under M50, so do not separately code cervicalgia (M54.2) when it is integral to the disc disorder.

Clinical context

Source · Editorial summary grounded in 7 cited references ↓

M50.91 applies when the treating provider documents a cervical disc disorder at the high cervical region (C1–C2, occipito-atlanto-axial level) but does not specify whether the pathology is myelopathy, radiculopathy, displacement, or degeneration. The 5th character '9' signals unspecified disc disorder type; the 5th character '1' pins the level to the high cervical region. If the note supports a specific disorder type — myelopathy (M50.01), radiculopathy (M50.11), displacement (M50.21), or degeneration (M50.31) — you must use that more specific code instead.

This code sits at the end of the M50 specificity ladder. Use it only when the documentation genuinely does not support a more granular assignment — not as a default when the provider hasn't yet been queried. If the region is also unspecified, drop to M50.90. If the level extends into the cervicothoracic junction, use M50.93 (cervicothoracic region). The high cervical level is anatomically distinct: discs at C1–C2 are atypical in structure, making true disc pathology here less common than at mid-cervical levels; confirm the documented level before assigning M50.91.

Imaging codes typically paired with this diagnosis include cervical spine MRI (72141, 72142, 72156) and cervical spine X-ray (72040, 72050, 72052). Procedural codes vary widely depending on whether management is conservative, interventional, or surgical. Payers may scrutinize unspecified codes; a provider query to clarify disc pathology type can upgrade specificity and reduce audit risk.

Inclusion & exclusion notes

Per the official ICD-10-CM Tabular List.

Source · CDC ICD-10-CM Official Tabular List · 2026

Includes

C2-C3 cervical disc disorder, unspecified
C3-C4 cervical disc disorder, unspecified

Sibling codes

Other billable codes under M50.9 (laterality / anatomic variants).

M50.93

Cervical disc disorder, unspecified, cervicothoracic region

M50.90

Cervical disc disorder, unsp, unspecified cervical region

Frequently asked questions

Source · Generated from the editorial pipeline, verified against 7 cited references ↓

01What cervical levels does 'high cervical region' cover for M50.91?

The high cervical region in the M50 code family corresponds to the occipito-atlanto-axial region — essentially C1–C2. This is distinct from the mid-cervical region (C3–C7) coded with the '2' 5th character.

02When should I use M50.91 instead of a more specific M50.x1 code?

Use M50.91 only when the provider's documentation does not characterize the disc pathology as myelopathy, radiculopathy, displacement, or degeneration. If any of those are documented or supported by imaging, the corresponding specific code (M50.01, M50.11, M50.21, or M50.31) is required.

03Can I code cervicalgia (M54.2) separately alongside M50.91?

No. The M50 category includes cervicothoracic disc disorders with cervicalgia. When neck pain is a symptom of the disc disorder, it is captured within M50.91 and should not be coded separately.

04Is M50.91 valid for inpatient facility coding?

Yes, M50.91 is a billable ICD-10-CM code valid in all settings. However, inpatient coders should apply the same specificity rules — if the attending's final diagnosis supports a more specific M50 code, use it.

05What imaging CPT codes are commonly paired with M50.91?

Cervical spine MRI without contrast (72141), with contrast (72142), or without then with contrast (72156) are the most common pairings. Cervical spine X-rays (72040, 72050, 72052) are used for initial workup. Confirm individual payer LCDs for coverage requirements tied to an unspecified disc disorder diagnosis.

06Does M50.91 require a 7th-character extension?

No. M50.91 is an M-code (musculoskeletal disease chapter) and does not use 7th-character episode-of-care extensions. Those extensions (A, D, S) apply to injury codes in the S-code range.

07How does M50.91 differ from M50.90?

M50.90 is cervical disc disorder, unspecified, with both the disc type and the cervical region unspecified. M50.91 narrows the region to the high cervical level (C1–C2). Use M50.91 only when the provider or imaging report documents high cervical or C1–C2 level involvement.

Sources & references

Editorial content was developed using the following public sources. Last verified May 8, 2026.

Mira AI Scribe

Mira AI Scribe captures the provider's documented cervical level (C1–C2 or occipito-atlanto-axial), disc pathology characterization (or explicit absence thereof), relevant imaging findings such as MRI signal changes or disc height loss, and any associated neurologic symptoms. Capturing this detail prevents assignment of the unspecified code when a more specific M50.x1 variant is supportable, reducing payer scrutiny and potential downcoding on audit.

See how Mira captures M50.91 documentation