M99.47 identifies narrowing of the neural canal in the upper extremity caused by connective tissue pathology, classified under biomechanical lesions not elsewhere classified.
Verified May 8, 2026 · 5 sources ↓
- Status
- Billable
- Chapter
- 13
- Related CPT
- 9
- Region
- Shoulder
Documentation tips
What should appear in the chart to support M99.47.
Source · Editorial brief grounded in 5 cited references ↓
- Specify that the neural canal narrowing mechanism is connective tissue (fibrosis, ligamentous hypertrophy, scar tissue) rather than osseous overgrowth or disc herniation — this distinction drives the correct M99.4x vs. M99.2x vs. M99.5x code.
- Record upper extremity neurological findings (radiculopathy pattern, dermatomal numbness, motor weakness, diminished reflexes) that correlate with the stenotic level.
- Include imaging interpretation (MRI or CT) referencing soft-tissue canal narrowing; a Kellgren-Lawrence or similar grading note is not required here, but radiologist language confirming connective tissue as the compressive element strengthens medical necessity.
- Document conservative care history (physical therapy, chiropractic manipulation, injections) if the encounter is supporting continued or escalating treatment — payers may require it for M99-category billing.
- If the treating provider is using osteopathic or chiropractic manipulation (OMT/CMT), M99.47 is an accepted supporting diagnosis; make sure the primary reason for the visit is also coded.
Related CPT procedures
Procedure codes commonly billed with M99.47. Linking the right diagnosis to the right procedure is what establishes medical necessity.
Source · CMS LCDs · AAOS specialty guidance · claims-pattern analysis
Common coding pitfalls
The recurring mistakes coders make with M99.47 and adjacent codes.
Source · Editorial brief grounded in CDC ICD-10-CM tabular guidance, AAOS coding references, and cited references ↓
- Defaulting to M99.47 when a more specific structural diagnosis (e.g., cervical spondylosis M47.812, cervical disc disorder M50.1x) already captures the stenosis — use the specific code first; M99.47 is for biomechanical presentations not elsewhere classified.
- Confusing M99.47 (connective tissue stenosis) with M99.27 (osseous stenosis of neural canal, upper extremity) — the distinction depends entirely on documented cause; imaging or provider narrative must support soft tissue vs. bony compression.
- Assuming laterality is coded at the 6th character for M99.47 — it is not; the code is complete as a 5-character billable code without further laterality extension.
- Using M99.47 for intervertebral disc-related upper extremity canal stenosis — that maps to M99.57 (intervertebral disc stenosis of neural canal, upper extremity), a different parent subcategory.
Clinical context
Source · Editorial summary grounded in 5 cited references ↓
M99.47 applies when connective tissue — ligaments, fascia, scar tissue, or fibrotic soft tissue — mechanically compresses or narrows the neural canal in the upper extremity. This is distinct from osseous stenosis (M99.27), subluxation-driven stenosis (M99.17), or intervertebral disc stenosis (M99.57) of the same region. The mechanism must be documented as connective tissue in origin; payer auditors will scrutinize codes in the M99 range and expect supporting clinical or imaging documentation.
M99.47 sits within the M99 biomechanical lesions category, which is frequently used in chiropractic, osteopathic, physiatry, and orthopedic spine practices. It is not a spinal stenosis code in the traditional sense — M99 codes capture biomechanical lesion presentations that don't fit neatly into the degenerative or structural spine categories. If the stenosis is clearly attributable to a discrete structural diagnosis (e.g., cervical spondylosis with myelopathy or a herniated disc compressing a nerve root), code that condition directly rather than defaulting to M99.47.
No laterality subcode exists within M99.47 — the code covers the upper extremity region as a whole without a right/left distinction. If bilateral involvement is relevant, document it in the clinical note; a single M99.47 code covers the region. Do not assign M99.47 alongside a more specific code that already captures the same stenotic mechanism.
Sibling codes
Other billable codes under M99.4 (laterality / anatomic variants).
Frequently asked questions
Source · Generated from the editorial pipeline, verified against 5 cited references ↓
01Does M99.47 require a 7th character?
02Can M99.47 be used for both right and left upper extremity involvement?
03What distinguishes M99.47 from M99.27?
04Is M99.47 appropriate for cervical radiculopathy presentations?
05Is M99.47 valid for chiropractic and osteopathic manipulation billing?
06What CPT procedures most commonly pair with M99.47?
Sources & references
Editorial content was developed using the following public sources. Last verified May 8, 2026.
- 01CDC ICD-10-CM Tabular List 2026 (effective Oct 1, 2025)
- 02icd10data.comhttps://www.icd10data.com/ICD10CM/Codes/M00-M99/M99-M99/M99-/M99.47
- 03aapc.comhttps://www.aapc.com/codes/icd-10-codes/M99.47
- 04cms.govhttps://www.cms.gov/medicare/coding/icd10/downloads/icd10clinicalconceptsorthopedics1.pdf
- 05icd10data.comhttps://www.icd10data.com/ICD10CM/Codes/M00-M99/M99-M99/M99-
Mira AI Scribe
Mira AI Scribe captures the provider's description of the compressive mechanism (fibrosis, ligamentous thickening, scar tissue), the affected neural canal region in the upper extremity, associated neurological symptoms (dermatomal distribution, motor or sensory deficits), and relevant imaging language confirming soft-tissue stenosis. Capturing these elements prevents downcoding to an unspecified stenosis code and blocks audit flags triggered by M99-category claims submitted without supporting clinical rationale.
See how Mira captures M99.47 documentation