Medicare SLP documentation requirements: what your record needs to support
Outpatient speech-language pathology under Medicare Part B follows the same documentation framework as PT and OT — evaluation, plan of care, treatment notes, progress reports — with SLP-specific codes and the GN therapy modifier.
Four parts of an auditable SLP record
Evaluation
Establishes the communication or swallowing disorder and the need for skilled SLP services.
Plan of care
Functional goals, frequency, duration, and physician/NPP certification within required timeframes.
Treatment notes
What was done each visit and the skilled nature of it; many SLP codes are untimed.
Progress reports
Objective progress toward goals that justifies continued skilled care.
SLP specifics to get right
The GN modifier
Outpatient SLP services are reported under an SLP plan of care with the GN modifier.
Timed vs. untimed codes
Many SLP services are untimed and are not subject to the 8-minute rule; verify each code before billing units.
Functional necessity
Goals tied to functional communication or safe swallowing, not generalized improvement.
Before signing an SLP note
Necessity reads as skilled
The note defends why a qualified SLP’s skill was required.
Codes billed correctly
Untimed codes are not billed as timed units; any timed codes reconcile to minutes.
Modifiers present
GN and any applicable KX/NCCI modifiers are in place and supported.
Frequently asked questions
What modifier identifies speech-language pathology services to Medicare?
Medicare uses the GN modifier for services delivered under an outpatient speech-language pathology plan of care (GP for physical therapy, GO for occupational therapy).
Do SLP services follow the 8-minute rule?
Many speech-language pathology services are billed as untimed codes, which are not subject to the 8-minute rule. Where a timed code is used, the rule applies — confirm whether each code is timed or untimed.
What makes SLP documentation 'skilled'?
The record should show the services required the knowledge and judgment of a qualified speech-language pathologist, with functional communication or swallowing goals and progress that justify continued skilled care.
Verify against current CMS guidance
Educational summary only. Review the current Medicare manuals, applicable Medicare Administrative Contractor rules, and payer-specific policies. No article substitutes for clinical or billing advice.
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