🗣️ CPT 96105 — Assessment of Aphasia With Interpretation and Report
Quick Reference
wRVU: 1.75 | Global Period: XXX (not applicable) | Assistant Payable: ❌ No | Bilateral Indicator: 0
📋 Clinical Description
CPT 96105 describes a formal, hour-based diagnostic evaluation of a patient’s language function, typically administered using a standardized instrument such as the Boston Diagnostic Aphasia Examination. The provider — a physician or licensed speech-language pathologist — assesses expressive and receptive speech, language comprehension, speech production, reading, spelling, and writing, then produces an interpretive report summarizing findings. This code is time-based (billed per hour), which distinguishes it from cognitive performance testing under 96125, a closely related sibling code used for broader cognitive-communication deficits rather than aphasia specifically.
Aphasia — R47.01 and related codes it — is a language disorder that impairs a person’s ability to understand or produce speech, most commonly resulting from a stroke, traumatic brain injury, or progressive neurological disease. When aphasia results from an acute cerebrovascular event, the stroke sequela codes (e.g., I69.320) drive clinical coding and should be linked as the underlying etiology rather than coding aphasia in isolation.
This procedure may be performed in the following clinical contexts:
- Post-stroke aphasia evaluation — assesses residual language deficits following an acute cerebrovascular accident to guide speech therapy planning.
- Traumatic brain injury workup — evaluates communication deficits following head trauma as part of a broader neurorehabilitation assessment.
- Progressive neurological disease — used when a degenerative condition such as primary progressive aphasia associated with frontotemporal dementia causes gradual language decline.
- Pre- and post-treatment monitoring — repeated administration to document functional change over the course of speech therapy, supporting medical necessity for continued treatment.
- Tumor-related language deficits — performed when a CNS neoplasm (e.g., C71.9) produces localized language impairment requiring baseline functional documentation.
🔬 Anatomical & Procedural Considerations
| Assessment Domain | Mechanism | Key Notes |
|---|---|---|
| Expressive language | Standardized prompts evaluate spoken word retrieval, sentence formation, and fluency | Documentation must specify severity (mild/moderate/severe) to support medical necessity |
| Receptive language | Patient responds to auditory and written commands to test comprehension | Distinguishes fluent (Wernicke’s) vs. non-fluent (Broca’s) aphasia subtypes |
| Reading/writing/spelling | Written tasks assess alexia and agraphia components | Report must document time spent, as this is a time-based per-hour code |
Clinical Pearl
Because 96105 is billed per hour, the note must explicitly state total face-to-face time spent administering and interpreting the test — vague documentation like “aphasia testing performed” without a time statement is one of the most common audit denials for this code.
✅ Procedure Includes
- Pre-test review of relevant medical and speech-language history
- Administration of a standardized aphasia battery (e.g., Boston Diagnostic Aphasia Examination)
- Direct patient interaction across expressive, receptive, reading, and writing domains
- Scoring and clinical interpretation of test results
- Generation of a written interpretive report
- Documentation of total time spent, required to support the per-hour billing unit
❌ Excludes / Do Not Report Together
| Code | Description | Relationship to 96105 |
|---|---|---|
| 96125 | Standardized cognitive performance testing, per hour | Mutually exclusive when testing the same encounter for the same deficit domain — select 96105 specifically when aphasia (language) is the focus rather than broader cognitive-communication impairment |
| 92523 | Evaluation of speech sound production with evaluation of language comprehension and expression | Represents a lower-complexity, non-standardized speech/language evaluation; not reported together with 96105 for the same encounter and same testing purpose |
| E/M codes (992xx) | Office or outpatient visit, any level | Separately reportable only when modifier -25 is appended to the E/M code, documenting a significant, separately identifiable service beyond the pre-test evaluation |
Bundling Alert — Global Period is XXX, Not 000/010/090
A global period concept does not apply to diagnostic testing codes like 96105 since there is no surgical episode of care. This means there is no post-procedure follow-up bundling window, but repeat administrations within a short time frame may still trigger payer medical necessity review for duplicate testing.
🌳 Code Tree — Medicine: Central Nervous System Assessments/Tests
CPT 96105-96146 Central Nervous System Assessments/Tests
│
├── ▶▶ 96105 ◀◀ Assessment of aphasia with interpretation and report ← YOU ARE HERE (Global: XXX)
├── 96110 Developmental screening
├── 96112 Developmental test administration, first hour
├── 96116 Neurobehavioral status exam
├── 96125 Standardized cognitive performance testing, per hour
└── 96130-96146 Psychological and neuropsychological testing family
💰 RVU & Reimbursement Profile
| Component | Value |
|---|---|
| Work RVU (wRVU) | 1.75 (verify against current CMS MPFS for applicable year) |
| Total RVU | 2.91 |
| Global Period | XXX (not applicable) |
| Bilateral Indicator | 0 — not subject to bilateral reduction rules |
| Assistant Surgeon | ❌ Not payable |
| PC/TC Split | ❌ No — procedure code only (Indicator 0) |
| Modifier -51 Exempt | No |
Time-Based Billing Rules
🏷️ Modifier Reference
| Modifier | Name | When to Apply |
|---|---|---|
| -59 | Distinct Procedural Service | When payers bundle 96105 with another same-day evaluation code and documentation supports a distinct, medically necessary service |
| -76 | Repeat Procedure by Same Physician | When aphasia testing is repeated on the same day by the same provider to complete a lengthy evaluation |
| -77 | Repeat Procedure by Another Physician | When a different qualified provider repeats testing on the same day |
| -25 | Significant, Separately Identifiable E/M | Applied to the E/M code — not 96105 — when a separately documented evaluation occurs the same day |
| -GN | Services delivered under an outpatient speech-language pathology plan of care | Required by Medicare when the service is furnished by or incident to a speech-language pathologist |
🩺 Common ICD-10-CM Pairings
Aphasia — Primary Diagnosis Grouping
| ICD-10 Code | Description | HCC? | Clinical Notes |
|---|---|---|---|
| R47.01 | Aphasia | ❌ No | Use when aphasia is documented as a symptom without a definitively linked underlying cause; query provider for etiology when possible |
| R47.02 | Dysphasia | ❌ No | Represents a milder or partial language impairment distinct from full aphasia; select based on documented severity |
| I69.320 | Aphasia following cerebral infarction | ❌ No | Use when aphasia is a documented sequela of a prior stroke; this code drives coding over R47.01 once the etiology is established |
| I69.322 | Dysphasia following cerebral infarction | ❌ No | Sequela code for milder post-stroke language impairment |
Underlying Etiology Codes
| ICD-10 Code | Description | HCC? | Clinical Notes |
|---|---|---|---|
| S06.2X9S | Diffuse traumatic brain injury with loss of consciousness, sequela | ✅ HCC 103 | Report as additional diagnosis when aphasia is a documented sequela of traumatic brain injury; supports medical necessity for ongoing testing |
| G31.83 | Dementia with Lewy bodies (or other applicable degenerative code) | ✅ HCC 52 | Use when progressive aphasia is linked to an underlying degenerative neurocognitive disease |
| C71.9 | Malignant neoplasm of brain, unspecified | ✅ HCC 12 | Report when a CNS tumor is the documented cause of language impairment |
Coding Specificity Reminder
The most commonly missed specificity element for 96105 pairings is etiology — coders frequently default to unspecified R47.01 when the medical record clearly documents a prior stroke or TBI as the cause. ICD-10-CM specificity requirements are not optional, so always query the provider when etiology is implied but not explicitly linked in the note.
🏥 MS-DRG Considerations (Inpatient)
Inpatient Coding Reminder
CPT 96105 is a diagnostic ancillary service and does not independently drive MS-DRG assignment. When performed during an inpatient stay for stroke, TBI, or CNS tumor, the underlying principal diagnosis (e.g., cerebral infarction) determines the DRG, while 96105 documentation supports functional status, HCC capture, and discharge planning rather than grouping logic.
📝 Coding Examples
Example 1 — Outpatient: Post-Stroke Language Evaluation
Clinical Scenario: A 68-year-old male presents to an outpatient rehab clinic three weeks after an ischemic stroke with residual word-finding difficulty. The speech-language pathologist administers the Boston Diagnostic Aphasia Examination over 55 minutes, documenting moderate non-fluent aphasia with preserved comprehension. No separate E/M was billed.
| Field | Code | Rationale |
|---|---|---|
| CPT | 96105-GN | Per-hour aphasia assessment performed by SLP under an outpatient plan of care |
| PDx | I69.320 | Aphasia specifically linked to prior cerebral infarction, most specific available code |
Note
Example 2 — Inpatient: TBI With Same-Day E/M
Clinical Scenario: A 42-year-old female is admitted following a motor vehicle collision with a diffuse traumatic brain injury and loss of consciousness. During the admission, the treating physiatrist personally performs a 60-minute standardized aphasia evaluation and also completes a separately documented subsequent hospital care visit addressing unrelated pain management.
| Field | Code | Rationale |
|---|---|---|
| CPT 1 | 99232-25 | Subsequent hospital care visit, separately identifiable from the testing service |
| CPT 2 | 96105 | Full-hour standardized aphasia assessment with interpretation and report |
| PDx | S06.2X9S | Diffuse TBI with loss of consciousness, sequela — supports medical necessity and HCC capture |
Warning
⚠️ Common Coding Pitfalls
-
Missing time documentation: Since 96105 is a per-hour code, failing to document total time spent will result in payer downcoding or denial; the note must state a specific time value or a clear start/stop time.
-
Confusing 96105 with 96125: These sibling codes are frequently mixed up — 96105 targets aphasia specifically via standardized language batteries, while 96125 addresses broader standardized cognitive performance testing; select based on the documented deficit domain being assessed.
-
Defaulting to unspecified R47.01 without querying etiology: When the chart clearly documents a stroke, TBI, or tumor as the cause, coders must query for the sequela or etiology-linked code rather than defaulting to the unspecified aphasia code.
-
Billing -25 without a truly separate E/M: The pre-test clinical interview bundled into 96105 does not itself justify a separate E/M charge; -25 requires a distinct, medically necessary evaluation beyond routine pre-test assessment.
-
Reporting 96105 and 92523 for the same encounter and purpose: These codes represent different complexity levels of language assessment and should not both be billed for the same testing session targeting the same deficit.
📎 Sources
AAPC CPT Code 96105 Reference1 · FastRVU 2026 RVU Data2 · AMA CPT 2025/2026 Professional Edition · CMS 2026 Medicare Physician Fee Schedule · ICD-10-CM Official Guidelines for Coding and Reporting FY2026