ICD-10 Code F06.7: Mild Neurocognitive Disorder Due to Known Physiological Condition — Complete Coding & Billing Guide

ICD-10-CM code F06.7 — Mild neurocognitive disorder due to known physiological condition — is a non-billable parent code that serves as the header for two billable child codes: F06.70 (without behavioral disturbance) and F06.71 (with behavioral disturbance). It classifies cognitive decline that is causally linked to an identified underlying medical condition, falls short of meeting criteria for dementia, and is distinct from age-related memory changes. Because F06.7 itself is not directly submittable on a claim, coders must select the appropriate fifth-digit subcategory — and must sequence the underlying physiological cause first.

What Does ICD-10 Code F06.7 Mean?

F06.7 represents a spectrum of cognitive impairment that is clinically meaningful, etiologically linked to a documented physiological condition, yet not severe enough to qualify as major neurocognitive disorder (dementia). The condition is sometimes referred to as mild cognitive impairment (MCI) in clinical literature, though the ICD-10-CM terminology is more precise: it requires a known, documented cause.

Key attributes of this code family:

• Not directly billable — coders must use F06.70 or F06.71
• Requires a “code first” underlying condition (e.g., Parkinson’s disease, HIV, Alzheimer’s disease, traumatic brain injury)
• Applies in both inpatient and outpatient settings when documentation supports the diagnosis
• Classified under Chapter 5: Mental, Behavioral and Neurodevelopmental Disorders (F01–F99), subcategory F06 (Other mental disorders due to known physiological condition)
• Valid for FY 2026 with no description changes since FY 2024

What Conditions Does F06.7 Cover — and What Are Its Billable Child Codes?

The F06.7 subcategory captures mild neurocognitive impairment that is a direct manifestation of a separately coded physiological disorder. This includes cognitive deficits arising from:

• Alzheimer’s disease (G30.–) — early-stage, pre-dementia presentation
• Parkinson’s disease (G20.–) — cognitive features without meeting full dementia criteria
• HIV disease (B20) — HIV-associated neurocognitive impairment, mild stage
• Huntington’s disease (G10)
• Neurocognitive disorder with Lewy bodies (G31.83)
• Frontotemporal neurocognitive disorder (G31.09)
• Systemic lupus erythematosus (M32.–)
• Vitamin B deficiency affecting the central nervous system (E53.–)
• Traumatic brain injury (S06.–) — note the important exclusion discussed below

What Does This Code Specifically Exclude?

The exclusions for F06.7 are clinically important and directly affect code selection. Coders must review these before assigning any F06.7x code:

Excluded Condition	Correct Code	Why It’s Excluded
Age-related cognitive decline (no known cause)	R41.81	Not caused by an identified physiological condition
Altered mental status / change in mental status	R41.82	Symptom-level finding, not a disorder
Mild cognitive impairment, unknown or unspecified etiology	G31.84	No confirmed underlying cause documented
Dementia (major NCD)	F01.–, F02.–, F03.–	Severity threshold exceeds mild NCD
Delirium due to known physiological condition	F05	Acute onset, fluctuating consciousness
Cerebrovascular sequelae (post-stroke cognitive deficits)	I69.01–, I69.91–	Specific sequelae codes take precedence
Cognitive impairment from intracranial/head injury	S06.–	Injury code supersedes F06.7x
Substance-related cognitive disorders	F10–F19	Substance etiology coded separately

When Is F06.70 or F06.71 the Right Code to Use?

F06.7x is appropriate when all of the following criteria are met. Work through these in sequence before assigning either child code:

1. The provider has documented a diagnosis of mild neurocognitive disorder (or equivalent clinical language such as “mild cognitive impairment” with an attributable cause) — not merely a complaint of forgetfulness.
2. An underlying physiological condition is explicitly linked to the cognitive symptoms in the provider’s documentation — causal language (“due to,” “secondary to,” “in the setting of”) must be present or clearly implied.
3. The severity does not meet criteria for dementia — the patient retains independent functioning in daily activities, even if performance is subtly reduced.
4. The etiological condition is not one that triggers an Excludes1 override (see the exclusion table above — post-stroke deficits and head injury, for example, are coded differently).
5. Select the fifth-digit specifier based on documented behavioral disturbance:
   • Use F06.70 when no behavioral disturbance (agitation, wandering, aggression, sleep disturbance) is documented.
   • Use F06.71 when behavioral disturbance is explicitly documented by the provider.

How Does F06.70 Differ From F06.71?

Feature	F06.70	F06.71
Full description	Without behavioral disturbance	With behavioral disturbance
Behavioral symptoms documented?	No	Yes (agitation, wandering, aggression, etc.)
MS-DRG grouping	884 — Organic disturbances & intellectual disability	884 — Organic disturbances & intellectual disability
Documentation requirement	Cognitive decline linked to cause; no behavioral symptoms noted	Explicit provider notation of behavioral disturbance
Common clinical context	Parkinson’s, early Alzheimer’s, HIV-associated MCI	TBI-related MCI with irritability; Lewy body with agitation

In practice, coders frequently default to F06.70 without querying whether behavioral disturbance is present, leaving accurate specificity — and potentially higher acuity documentation — uncaptured. Auditors reviewing records for diagnosis code specificity will flag cases where behavioral symptoms are documented in nursing or therapy notes but not reflected in the assigned code.

What Documentation Is Required to Support F06.70 or F06.71?

Strong documentation is the foundation for both accurate coding and successful claims adjudication. Missing or vague records are the leading cause of payer queries and audit findings in this code category.

What Must the Provider Document in the Clinical Notes?

1. An explicit diagnosis of mild neurocognitive disorder or clinically equivalent language (e.g., “mild cognitive impairment due to Parkinson’s disease”)
2. The causal or attributable relationship between the underlying condition and the cognitive symptoms — linking language is mandatory
3. Cognitive domain(s) affected — memory, attention, executive function, language, visuospatial ability
4. Evidence that functioning in activities of daily living (ADLs) is preserved or only minimally impacted (distinguishing mild NCD from dementia)
5. For F06.71 specifically: explicit documentation of behavioral disturbance type (e.g., “patient exhibits agitation and sleep-wake cycle disruption secondary to Lewy body disease”)
6. Reference to or results from standardized cognitive assessment (MoCA, MMSE, or neuropsychological testing) supporting the mild severity designation

Which Diagnostic or Lab Results Support This Code?

• Neuropsychological testing results showing performance below age-expected norms but above dementia thresholds
• Montreal Cognitive Assessment (MoCA) score (typically 18–25 range for mild impairment)
• Mini-Mental State Examination (MMSE) results
• Brain imaging (MRI/CT) consistent with the underlying condition (e.g., white matter changes in SLE, substantia nigra findings in Parkinson’s)
• Laboratory results supporting the underlying etiology (e.g., serum B12 levels for vitamin B deficiency, HIV viral load and CD4 count for HIV-associated NCD, ANA titers for SLE)

What Is the Documentation Standard for Inpatient vs. Outpatient Settings?

Setting	Documentation Standard
Outpatient	Code the confirmed diagnosis only if provider states it in the assessment/plan; do not code based on symptoms alone; code the underlying condition first per “code first” instruction
Inpatient	Coders may query providers to clarify the relationship between cognitive findings and the physiological condition; “probable” diagnoses may be coded as confirmed per ICD-10-CM Official Coding Guidelines Section II

How Does F06.7x Affect Medical Billing and Claims?

Accurate assignment of F06.70 or F06.71 directly affects medical necessity determinations, MS-DRG assignment in inpatient settings, and payer coverage for associated cognitive evaluation services.

Key billing considerations:

• Both F06.70 and F06.71 group to MS-DRG 884 (Organic disturbances and intellectual disability) when coded as the principal diagnosis on an inpatient claim
• The “code first” instruction is mandatory — submitting F06.70 or F06.71 as the first-listed code without the underlying physiological condition code will often trigger a claim edit or denial
• Payers increasingly require medical necessity documentation for cognitive evaluation procedures billed alongside F06.7x codes
• These codes support medical necessity for care planning services (CPT 99483) and neuropsychological testing

What CPT or Procedure Codes Are Commonly Billed With F06.70 and F06.71?

CPT Code	Description	Typical Pairing Context
96132	Neuropsychological testing evaluation, first hour	Initial cognitive evaluation to establish mild NCD severity
96133	Neuropsychological testing evaluation, each additional hour	Extended testing battery
99483	Assessment of and care planning for a patient with cognitive impairment	Annual cognitive care planning visit
96116	Neurobehavioral status exam, clinical assessment of thinking (first hour)	Behavioral evaluation for F06.71
90837 / 90834	Psychotherapy, 60/45 min	Co-occurring behavioral management in F06.71 cases

Are There Any Prior Authorization or Coverage Restrictions?

• Medicare covers neuropsychological testing (96132–96133) under the clinical psychologist or physician benefit; prior authorization requirements vary by Medicare Advantage plan
• Some commercial payers require pre-authorization for extended neuropsychological testing batteries (>3 hours)
• LCD requirements: Coders should verify applicable Local Coverage Determinations for cognitive testing in their MAC jurisdiction, as medical necessity documentation standards differ
• Behavioral health carve-out plans may process F06.71 differently from F06.70 — confirm payer behavioral health routing before submission

What Coding Errors Should You Avoid With F06.70 and F06.71?

These are the most frequently encountered errors in claims involving this code family, ranked by audit risk:

1. Submitting F06.7 (the non-billable parent) instead of F06.70 or F06.71 — F06.7 alone will be rejected; a fifth digit is always required.
2. Sequencing F06.70/F06.71 as the first-listed code without coding the underlying physiological condition first — this violates the mandatory “code first” instruction.
3. Using F06.70 or F06.71 when G31.84 is the correct code — if the provider documents mild cognitive impairment but does not identify a causal condition, G31.84 (unknown/unspecified etiology) applies, not F06.7x.
4. Assigning F06.7x when I69 sequelae codes apply — cognitive deficits following stroke are captured in the I69 code family; F06.7x is explicitly excluded in these cases.
5. Defaulting to F06.70 without checking for documented behavioral disturbance — missing F06.71 when behavioral symptoms are in the record is an undercoding error that can affect severity and resource classification.
6. Coding “cognitive decline” or “forgetfulness” directly to F06.7x — these symptom-level terms do not support a disorder-level diagnosis; a provider must document an actual diagnosis.

What Do Auditors Look for When Reviewing Claims With F06.70 or F06.71?

• Verification that the underlying physiological condition is coded and sequenced first
• Confirmation that the provider used diagnostic language, not symptom-level descriptors
• Presence of cognitive testing results in the record that align with mild (not major) severity
• For F06.71: explicit documentation of behavioral disturbance type and frequency
• Absence of contradictory documentation indicating severity consistent with dementia (F01–F03)

How Does F06.7 Relate to Other ICD-10 Codes?

Understanding the code neighborhood prevents both undercoding and incorrect exclusion violations.

Related Code	Relationship	Key Distinction
G31.84	Alternative — similar condition	Use when etiology is unknown or unspecified; mutually exclusive with F06.7x
F01.–, F02.–, F03.–	Excludes1	Dementia (major NCD); severity threshold exceeded
F05	Excludes2	Delirium — acute, fluctuating consciousness
R41.81	Excludes1	Age-related cognitive decline, no identified cause
I69.01–I69.91–	Excludes1	Post-stroke/cerebrovascular cognitive sequelae
S06.–	Excludes1	Head injury cognitive impairment — injury codes take precedence
F10–F19	Excludes2	Substance-related cognitive disorders coded here instead
G30.– (Alzheimer’s)	Code first	Common underlying condition triggering F06.7x
G20.– (Parkinson’s)	Code first	Common underlying condition; note G20 subcategory specificity required

What Is the Correct Code Sequencing When F06.7x Appears With Other Diagnoses?

1. First: Code the underlying physiological condition (e.g., G20.A1, G30.0, B20)
2. Second: Assign F06.70 or F06.71 as an additional diagnosis
3. Third: Code any behavioral disturbance-related conditions or associated comorbidities
4. Fourth: Assign any relevant Z codes (e.g., Z87.820 for personal history of TBI, if applicable)

Per ICD-10-CM Official Coding Guidelines Section I.C.5, the “code first” annotation is mandatory — it is not a suggestion. Failure to follow this sequencing constitutes a coding guideline violation that payers and auditors will flag.

Real-World Coding Scenario — How F06.7x Is Applied in Practice

Patient encounter: A 68-year-old male with documented Parkinson’s disease (G20.A1) presents to a neurology clinic for a follow-up visit. His neurologist notes in the assessment: “Patient demonstrates mild neurocognitive disorder attributable to his Parkinson’s disease. MoCA score 22/30. He is managing ADLs independently with mild prompting. Wife reports increasing irritability and sleep disturbance over the past three months.”

Correct Code Application

• G20.A1 — Parkinson’s disease without dyskinesia, without orthostatic hypotension (sequenced first per “code first” instruction)
• F06.71 — Mild neurocognitive disorder due to known physiological condition, with behavioral disturbance (behavioral disturbance — irritability and sleep disturbance — is explicitly documented)

Common Mistake in This Scenario

• Assigning F06.70 (without behavioral disturbance) because the coder focused only on the cognitive assessment and missed the behavioral symptoms documented later in the note
• Assigning G31.84 (mild cognitive impairment, unspecified etiology) — incorrect because the provider has clearly linked the cognitive impairment to Parkinson’s disease
• Sequencing F06.71 first and G20.A1 second — violates the mandatory “code first” instruction and will trigger a claim edit

Frequently Asked Questions About ICD-10 Code F06.7

Is ICD-10 Code F06.7 Billable in 2025 and 2026?

ICD-10 code F06.7 is not directly billable — it is a non-specific parent code that requires a fifth digit to be submitted on a claim. Coders must use F06.70 (without behavioral disturbance) or F06.71 (with behavioral disturbance), both of which are valid billable codes for FY 2025 and FY 2026 with no recent description changes.

What Is the Difference Between F06.70 and F06.71?

F06.70 applies when the provider documents mild neurocognitive disorder due to a known physiological condition without any behavioral disturbance such as agitation, aggression, wandering, or sleep-wake cycle disruption. F06.71 requires that behavioral disturbance be explicitly documented by the provider in the clinical notes — it cannot be inferred from nursing observations or family reports alone without a physician-level diagnostic statement.

What Is the Difference Between F06.7x and G31.84?

F06.70 and F06.71 require an identified, documented underlying physiological cause for the cognitive impairment, such as Parkinson’s disease, HIV, or Alzheimer’s disease. G31.84 is used when the provider documents mild cognitive impairment but the etiology is unknown or unspecified. These codes are mutually exclusive — assigning both to the same encounter would be incorrect.

Does the Underlying Condition Always Have to Be Sequenced First?

Yes, absolutely. The “code first” instruction in the ICD-10-CM tabular list for F06.7x is mandatory, not advisory. The underlying physiological condition code (e.g., G30.0, G20.A1, B20) must always appear before F06.70 or F06.71 on the claim. Submitting F06.7x as the primary diagnosis without the underlying condition code is a sequencing violation that will result in claim edits or payer queries under revenue cycle compliance standards.

What Documentation Does a Coder Need Before Assigning F06.71 for Behavioral Disturbance?

To support F06.71, the treating provider must explicitly document the presence of behavioral disturbance in their assessment or plan — general terms like agitation, irritability, aggression, sleep disturbance, or wandering qualify when linked to the neurocognitive disorder. Observations documented only in nursing notes or by family members, without a corresponding physician/provider diagnostic statement, are insufficient to support this code under ICD-10-CM Official Coding Guidelines outpatient rules.

Can F06.70 or F06.71 Be Used for Post-Stroke Cognitive Impairment?

No. Cognitive deficits following cerebrovascular accidents or hemorrhage are captured by the I69 sequelae code family (I69.01–, I69.11–, I69.21–, I69.31–, I69.81–, I69.91–), which are listed as an Excludes1 exception for F06.7x. An Excludes1 note means the two code groups cannot be assigned together for the same condition — F06.7x is not appropriate for post-stroke cognitive presentations.

Key Takeaways

• F06.7 is a non-billable parent code — always use F06.70 (without behavioral disturbance) or F06.71 (with behavioral disturbance) on actual claims.
• The “code first” instruction is mandatory: the underlying physiological condition must be sequenced before F06.70 or F06.71 on every claim.
• F06.7x requires an identified, documented etiological link between the physiological condition and the cognitive symptoms — unknown etiology maps to G31.84, not F06.7x.
• F06.71 demands explicit provider documentation of behavioral disturbance — coders cannot infer this from ancillary notes alone.
• The most frequent coding errors involve incorrect sequencing, using the non-billable parent, and confusing F06.7x with G31.84 or I69 sequelae codes.
• Both F06.70 and F06.71 group to MS-DRG 884 in inpatient settings and support medical necessity for neuropsychological testing (CPT 96132–96133) and cognitive care planning (CPT 99483).
• Verify annually against the CMS ICD-10-CM Official Coding Guidelines to confirm no updates have been applied to this subcategory.

For broader context on ICD-10-CM Official Coding Guidelines as they apply to mental disorder sequencing, coders may also reference the AHA Coding Clinic for case-specific guidance published by the American Hospital Association.