Crystal's Coder Hub🧬 ICD-10 CM G31.87 — Primary Progressive Apraxia of Speech
Billable Code Confirmed — NEW FY2026 Code
ICD-10 CM G31.87 is a valid, fully billable 5-character ICD-10-CM code, new effective October 1, 2025 (FY2026). It is classified under Chapter 6 (Diseases of the Nervous System), within the G30-G32 block (Other degenerative diseases of the nervous system), under category G31 (Other degenerative diseases of nervous system, not elsewhere classified). Prior to this code’s creation, primary progressive apraxia of speech had no dedicated ICD-10-CM code and was previously reported under G31.89 (Other specified degenerative diseases of nervous system) — that workaround is no longer appropriate when G31.87 is available and the diagnosis is specifically documented.¹⁵
Non-Billable Parent Code
G31 (Other degenerative diseases of nervous system, not elsewhere classified) is the 3-character parent category — not billable; it is a header code requiring additional characters. Note also that the G31 category carries an important “use additional code” instruction at the category level directing coders to also assign applicable codes for dementia manifestations (F02.80-F02.C4 series) and mild neurocognitive disorder (F06.7-) for other codes within G31, but importantly this instruction at the category level explicitly excludes G31.87 from the dementia use-additional-code requirement per AAPC and tabular guidance — coders should verify current tabular text.¹²
Clinical Context
Primary progressive apraxia of speech (PPAOS) is a neurodegenerative motor speech disorder characterized by a gradual, progressive impairment in the motor planning and programming of speech, in the absence of significant language impairment (aphasia) or global cognitive decline in early stages. It is critically distinct from primary progressive aphasia (G31.01), which affects language processing itself — PPAOS patients know what they want to say and understand language, but lose the ability to physically plan and execute speech sounds. PPAOS is most commonly caused by frontotemporal degeneration driven by 4-repeat tau protein accumulation, and is strongly associated with underlying corticobasal degeneration (G31.85) or progressive supranuclear palsy (G23.1).²⁶⁷ The average time from symptom onset to diagnosis is approximately 2.5 to 3 years, making CDI documentation accuracy especially important when the diagnosis is finally established.⁶
Code Classification
ICD-10 CM G31.87 is a diagnosis code (ICD-10-CM), representing a specific neurodegenerative disorder of the nervous system. It is not a symptom code, a procedure code, or a manifestation code. It is appropriate for use on both facility UB-04 claims and professional CMS-1500 claims, and is recognized by CMS as a supporting medical necessity code for home health speech-language pathology services under relevant LCDs.¹³
🔍 Code Description
ICD-10 CM G31.87 captures primary progressive apraxia of speech (PPAOS) — a rare, progressive neurodegenerative disorder in which the brain’s ability to plan and sequence the motor movements required for speech production deteriorates gradually over time. Unlike stroke-related apraxia of speech, which has a sudden onset and often plateau or improve with therapy, PPAOS follows an insidious, relentlessly progressive course with no curative treatment available. Patients typically present with inconsistent speech sound errors, slow speech rate, segmented syllable production, distorted vowels, and increasing effort with speech — all while language comprehension, reading, writing, and general cognition remain relatively preserved in the early stages. The disorder affects neurons in the frontal lobe premotor and supplementary motor areas, with brain imaging often showing left hemisphere frontal and parietal atrophy or hypometabolism on PET/SPECT. Neuropathologically, PPAOS is most commonly associated with corticobasal degeneration or progressive supranuclear palsy, both of which involve abnormal tau protein accumulation, though the definitive underlying pathology often cannot be confirmed until autopsy.²⁶⁷²
From a clinical documentation and coding perspective, G31.87 is a high-specificity code that should only be assigned when the provider has clearly documented a diagnosis of primary progressive apraxia of speech. Speech-language pathologists (SLPs) may encounter this diagnosis in their practice and, per ASHA guidance effective FY2026, SLPs may assign G31.87 directly in applicable billing scenarios.¹² Because PPAOS progresses to involve dysphagia, falls, and eventually aspiration pneumonia as corticobasal or PSP pathology advances, inpatient coders at profee and facility level should be alert to the associated complication codes that commonly accompany G31.87 in the later disease stages. Prior to FY2026, this condition was lumped under G31.89 — the creation of G31.87 represents an important improvement in clinical data granularity for this patient population.⁵
🌳 Code Tree / Hierarchy
G31 — Other degenerative diseases of nervous system, NEC ❌ Non-billable
│
├── G31.0 — Frontotemporal neurocognitive disorder ❌ Non-billable (parent)
│ │
│ ├── G31.01 — Primary progressive aphasia ✅ Billable
│ └── G31.09 — Other frontotemporal neurocognitive disorder ✅ Billable
│
├── G31.1 — Senile degeneration of brain, NEC ✅ Billable
│
├── G31.2 — Degeneration of nervous system due to alcohol ✅ Billable
│
├── G31.8 — Other specified degenerative diseases of nervous system ❌ Non-billable (parent)
│ │
│ ├── G31.81 — Alpers disease ✅ Billable
│ ├── G31.82 — Leigh disease ✅ Billable
│ ├── G31.83 — Dementia with Lewy bodies ✅ Billable
│ ├── G31.84 — Mild cognitive impairment, so stated ✅ Billable
│ ├── G31.85 — Corticobasal degeneration ✅ Billable
│ ├── G31.86 — Alexander disease ✅ Billable
│ ├── G31.87 — Primary progressive apraxia of speech ◀ THIS CODE ✅ Billable 🆕 FY2026
│ └── G31.89 — Other specified degenerative diseases of nervous system ✅ Billable
│
└── G31.9 — Degenerative disease of nervous system, unspecified ✅ Billable
G31.87 vs. G31.01 — The Most Critical Distinction in This Family
ICD-10 CM G31.01 (Primary progressive aphasia) affects language — word retrieval, comprehension, grammar. G31.87 (PPAOS) affects motor speech production — the physical planning and sequencing of speech movements — while language is preserved. Both involve progressive degeneration in the perisylvian/frontal region, but they are clinically and neuroanatomically distinct entities. Conflating them is a coding error. When documentation is ambiguous, query the neurologist or SLP for clarification on whether the primary deficit is linguistic or motor-speech.⁶⁹
Retired Workaround: G31.89 Is No Longer Appropriate for PPAOS
Before FY2026, PPAOS was coded under G31.89 (Other specified degenerative diseases of nervous system) as no specific code existed. Now that G31.87 is available, using G31.89 for a clearly documented PPAOS diagnosis violates ICD-10-CM specificity guidelines. Update any standing order sets, charge capture tools, or EHR favorites that previously mapped PPAOS to G31.89.¹⁵
✅ Includes
- PPAOS (Primary Progressive Apraxia of Speech): The primary clinical entity captured by this code; a neurodegenerative disorder specifically affecting motor speech planning with preserved language comprehension in early stages.⁷⁴
- Progressive apraxia of speech: The abbreviated clinical descriptor used by some neurology and SLP providers; maps to G31.87 per ICD-10-CM alphabetic index guidance.¹
- Primary progressive motor speech disorder: Alternate clinical phrasing used in some neurodegenerative movement disorder literature to describe the same entity.⁶
- Drug-unrelated progressive speech motor impairment with documented neurodegenerative etiology: When the progressive motor speech decline is clearly documented as part of frontotemporal degeneration (corticobasal, PSP) without drug causation, G31.87 is appropriate over movement disorder drug-induced codes.²⁷⁴
❌ Excludes
Excludes 1
There are no Excludes 1 notations at the G31.87 code level in FY2026 ICD-10-CM. Coders should review the full tabular at both the code level and the G31 category level for any conventions that apply.²
Do Not Confuse G31.87 With R47.01 or Stroke-Related Apraxia
A critical miscoding risk is assigning a symptom code like R47.01 (Aphasia — which is a symptom code, not an etiology code) or a stroke-related speech code when PPAOS is the documented diagnosis. Similarly, R48.2 (Apraxia) is a symptom/sign code and is inappropriate when a definitive diagnosis of G31.87 has been established. Per ICD-10-CM coding convention, definitive diagnosis codes take precedence over symptom codes. Stroke-related apraxia of speech codes from the I69.x series (sequelae of cerebrovascular disease) are never appropriate for PPAOS, which is a neurodegenerative condition, not a sequela of CVA.²¹
Excludes 2
- G93.7 — Reye’s syndrome: The Excludes 2 at the G31 category level indicates that Reye’s syndrome, while also a nervous system disorder, is not classified under G31; it is separately codeable and may be reported alongside G31.87 when both conditions are documented, though this combination would be clinically extraordinary.²
📋 Clinical Overview
PPAOS vs. Related Neurodegenerative Speech and Language Disorders
Precise diagnosis documentation is essential because the G31 family contains several closely related but clinically distinct neurodegenerative conditions affecting communication. The table below outlines the key differentiators for the most commonly confused codes a coder or CDI professional will encounter when PPAOS is documented.²⁶⁷⁶⁹
| Feature | G31.87 | G31.01 | G31.85 | G23.1 |
|---|---|---|---|---|
| Descriptor | Primary progressive apraxia of speech | Primary progressive aphasia | Corticobasal degeneration | Progressive supranuclear palsy |
| Core deficit | Motor speech planning/programming | Language (word retrieval, grammar, comprehension) | Motor + cognitive + limb apraxia | Eye movement, balance, swallowing, speech |
| Language preserved? | ✅ Yes (early) | ❌ No — language is the deficit | Partially | Partially |
| Speech character | Slow, effortful, distorted; segmented syllables | Word-finding pauses, phonologic errors, telegraphic | Dysarthria + apraxia combined | Dysarthria, hypophonia |
| Underlying pathology | Tau (CBD, PSP); frontotemporal degeneration | TDP-43, tau, or FUS; frontotemporal | Tau (CBD) | Tau (PSP) |
| SLP relevance | ✅ High — SLPs may assign per ASHA FY2026 guidance | ✅ High | Moderate | Moderate |
| HCC mapping (V28) | ❌ Not mapped | ❌ Not mapped | ❌ Not mapped | ❌ Not mapped |
CDI Trigger: Differentiate PPAOS from PPA on Every Record
When a provider documents “progressive speech difficulty,” “worsening articulation,” or “progressive loss of speech” in a patient with frontal lobe atrophy or known frontotemporal degeneration, this is a high-priority CDI query moment. Ask the provider to specify whether the primary deficit is motor-speech (supports G31.87) or linguistic/language-based (supports G31.01), as the two codes represent distinct diagnoses with different clinical trajectories, SLP care implications, and data reporting outcomes.¹²⁶
Manifestations & Symptom Burden
- Dysphagia (R13.10): As PPAOS progresses and underlying corticobasal or PSP pathology advances, dysphagia frequently develops; code separately as it is clinically significant and carries CC weight in some DRG contexts.⁷²
- Aspiration pneumonia (J69.0): A major and potentially fatal complication of advanced dysphagia in PPAOS; J69.0 is classified as an MCC and should be coded and sequenced appropriately when present.²
- Falls (Z91.81): Balance and gait disturbances become prominent in underlying PSP/CBD pathology; fall risk documentation supports care planning and may support secondary diagnosis capture.⁷²
- Communication impairment (R47.89): May be coded as an additional descriptor in early PPAOS when the specific motor speech deficit is documented but the full PPAOS diagnosis has not yet been formally established; however, once G31.87 is confirmed, the more specific diagnosis code takes precedence.²
- malnutrition (E43): Advanced dysphagia and progressive inability to eat effectively can lead to severe malnutrition; E43 (Severe malnutrition) is an MCC and critical to capture for accurate DRG assignment when present.²
Manifestation Coding Note
ICD-10 CM G31.87 is an etiology code, not a manifestation code. It does not carry a mandatory “code first” instruction. Associated manifestations (dysphagia, aspiration pneumonia, malnutrition) are coded separately as additional diagnoses when documented and clinically significant. The “use additional code” instruction present at the G31 category level for dementia codes (F02.x series) does not apply to G31.87 per the tabular exclusion range notation — verify in the current FY2026 tabular text.¹²
💰 HCC Risk Adjustment
| Model | HCC Mapping | HCC Label | RAF Value |
|---|---|---|---|
| CMS-HCC V28 (PY2026) | ❌ Not Mapped (new code — monitor future updates) | N/A | 0.000 |
| CMS-HCC V24 | ❌ Not Mapped | N/A | 0.000 |
| RxHCC | ❌ Not Mapped | N/A | 0.000 |
ICD-10 CM G31.87 does not currently map to any HCC under CMS-HCC V28, which is the sole risk adjustment model for Medicare Advantage as of PY2026.⁸⁹ As a new FY2026 code (effective 10/01/2025), its absence from current HCC mapping is expected — new codes often require one or more model revision cycles before CMS incorporates them into HCC mapping tables.⁸ Because PPAOS is a progressive neurodegenerative disease frequently associated with corticobasal degeneration and progressive supranuclear palsy, CDI professionals should ensure those comorbid diagnoses — if documented — are fully captured, as they may have their own HCC pathway in future model updates.⁹ Risk adjustment teams should flag G31.87 for review in the next CMS HCC model update announcement to determine whether it has been added to a payment HCC.⁸
🏥 MS-DRG Assignment
| Scenario | MDC | DRG | DRG Title | Relative Weight (approx.) |
|---|---|---|---|---|
| G31.87 as PDX with MCC | MDC 01 | 091 | Other Disorders of Nervous System with MCC | ~2.0 |
| G31.87 as PDX with CC | MDC 01 | 092 | Other Disorders of Nervous System with CC | ~1.2 |
| G31.87 as PDX w/o CC/MCC | MDC 01 | 093 | Other Disorders of Nervous System without CC/MCC | ~0.8 |
| G31.87 as secondary dx | Varies | Determined by PDX | N/A — secondary comorbidity | N/A |
ICD-10 CM G31.87 as principal diagnosis maps to MDC 01 and falls into DRGs 091-093 depending on secondary diagnosis CC/MCC burden.⁵ In clinical practice, PPAOS rarely drives a standalone inpatient admission; patients are far more commonly admitted for complications of the advancing disease — most critically aspiration pneumonia (J69.0, MCC), severe malnutrition (E43, MCC), or fall-related injuries — with G31.87 appearing as a secondary comorbidity.⁷² G31.87 itself is not a CC or MCC, so it does not independently contribute to DRG weight as a secondary diagnosis. Inpatient coders should aggressively capture MCC-level complications (aspiration pneumonia, severe malnutrition, sepsis) that commonly coexist in advanced PPAOS to support appropriate DRG weight. Because G31.87 is a new FY2026 code, coders should also confirm its CC/MCC status in the most current CMS CC/MCC lists, as newly added codes may receive CC/MCC designation in subsequent fiscal year updates.⁵²
🔗 Related ICD-10-CM Codes
Closely Related Neurodegenerative Diagnoses
- G31.01 — Primary progressive aphasia: The most clinically confused code with G31.87; affects language rather than motor speech production — never use interchangeably.⁶⁹
- G31.85 — Corticobasal degeneration: A common underlying neuropathological cause of PPAOS; may be coded alongside G31.87 when both conditions are separately and explicitly documented.⁷²
- G23.1 — Progressive supranuclear palsy: Another major neuropathological driver of PPAOS; code separately when documented.⁷²
- G31.09 — Other frontotemporal neurocognitive disorder: Use when frontotemporal degeneration affects cognition/behavior primarily rather than isolated motor speech; not a substitute for G31.87.⁶⁷
- G31.89 — Other specified degenerative diseases of nervous system: The former catch-all code previously used for PPAOS before FY2026 — no longer appropriate when G31.87 is available.¹⁵
Commonly Associated Complication and Comorbidity Codes
- R13.10 — Dysphagia, unspecified: Frequently develops in advancing PPAOS; code separately when documented.²
- J69.0 — Pneumonitis due to inhalation of food/vomit (Aspiration pneumonia): MCC-level complication of advanced dysphagia in PPAOS; critical to capture.²
- E43 — Unspecified severe protein-calorie malnutrition: MCC; may develop in advanced PPAOS with severe dysphagia.²
- R47.89 — Other speech disturbances: Appropriate as a symptom code only before a definitive PPAOS diagnosis is established; replaced by G31.87 once the diagnosis is confirmed.²
- [Z87.39] — Personal history of other endocrine, nutritional, and metabolic diseases: Not applicable here, but listed as a contrast; PPAOS is an active progressive condition, not a past history code.²
🛠️ Commonly Associated CPT Codes
- 92521 — Evaluation of speech fluency: SLP evaluation of motor speech characteristics; used alongside G31.87 to document baseline and track PPAOS progression in the outpatient setting.¹
- 92522 — Evaluation of speech sound production: Formal assessment of articulation and motor speech planning; core evaluation CPT for PPAOS workup and SLP documentation.¹²
- 92507 — Treatment of speech, language, voice, communication, and/or auditory processing disorder: Individual speech therapy; the primary therapeutic intervention for PPAOS to maintain intelligibility and develop AAC strategies; G31.87 supports medical necessity.⁶⁷²
- 92597 — Evaluation for use and/or fitting of voice prosthetic device to supplement oral speech: Relevant in advanced PPAOS when augmentative and alternative communication (AAC) devices become necessary; G31.87 supports medical necessity for AAC evaluation.⁷²
- 99483 — Assessment of and care planning for a patient with cognitive impairment: Although PPAOS primarily affects motor speech rather than cognition, this CPT is commonly used when cognitive components co-evolve with the speech disorder in later disease stages.⁵³
- 70553 — MRI brain without and with contrast: Standard neuroimaging used in the diagnostic workup of PPAOS to identify frontal/parietal atrophy and rule out other etiologies; G31.87 supports medical necessity for advanced MRI protocols.⁷²
NCCI Bundling Considerations
ICD-10 CM G31.87 is a diagnosis code and does not trigger NCCI procedure-to-procedure bundles directly; bundling decisions are driven by the CPT codes reported alongside it.² When multiple speech-language evaluation codes (e.g., 92521 and 92522) are billed on the same date by the same provider, NCCI edits may flag them as potentially bundled — documentation must clearly support distinct, separately assessable components of the evaluation to justify unbundling with modifier -59 if needed.² For inpatient profee claims, ensure that SLP evaluation and treatment CPTs are billed with the appropriate place of service and that G31.87 is reflected in the supporting diagnosis field to establish medical necessity and satisfy payer audit criteria.¹
🔬 ICD-10-PCS Crosswalk
ICD-10-PCS codes apply to inpatient facility procedure reporting only. The following represent procedures performed in the inpatient setting for patients with G31.87.
- F06Z0ZZ — Speech treatment, motor speech, none (no qualifier): Represents inpatient speech therapy focused on motor speech function; the most directly relevant PCS code for inpatient SLP intervention in PPAOS patients.²
- GZJ0ZZZ — Light therapy: Included for completeness in complex neuropsychiatric inpatient stays; rarely the primary PCS code but may appear alongside G31.87 in multidisciplinary neurodegenerative care admissions.²
- B030YZZ — Plain radiography, brain, other contrast: Represents diagnostic imaging performed inpatient during initial PPAOS workup or during complications; supportive of G31.87 as principal or secondary diagnosis on facility claims.²
💊 Coding Scenarios and Examples
Scenario 1: Initial Inpatient Neurology Workup for Progressive Speech Deterioration
A 68-year-old male is admitted to neurology for a 3-year history of progressively worsening speech difficulty. He speaks slowly, with great effort, distorted vowels, and increasingly unintelligible output. His family reports that he understands everything said to him, follows commands without difficulty, and his memory and reasoning remain intact. Brain MRI shows left frontal and supplementary motor area atrophy. Neurology documents “primary progressive apraxia of speech consistent with underlying frontotemporal degeneration.” SLP evaluation is performed inpatient.
Correct Coding:
- G31.87 — Primary progressive apraxia of speech (PDX — reason for admission after study)
- R13.10 — Dysphagia, unspecified (if documented by SLP or MD)
Sequencing: G31.87 is PDX per UHDDS. Note that the “use additional code” dementia instruction at the G31 category level does not apply to G31.87 — do not add F02.x codes unless dementia is separately and explicitly documented.
CDI Note: If the provider had documented only “progressive speech impairment” or “motor speech disorder,” a CDI query would be warranted to establish the specific PPAOS diagnosis before assigning G31.87. Do not assign G31.87 based solely on SLP assessment without physician/provider confirmation of the diagnosis.¹²⁶
Scenario 2: Aspiration Pneumonia Admission in Advanced PPAOS
A 74-year-old female with a known history of primary progressive apraxia of speech (documented in prior neurology records, now on the problem list) is admitted with fever, productive cough, and imaging consistent with right lower lobe aspiration pneumonia. The admitting provider’s assessment documents “aspiration pneumonia secondary to dysphagia from progressive apraxia of speech.” SLP is consulted and documents severe oropharyngeal dysphagia with aspiration.
Correct Coding:
- J69.0 — Pneumonitis due to solids and liquids (Aspiration pneumonia) — PDX
- G31.87 — Primary progressive apraxia of speech — secondary
- R13.19 — Other dysphagia — secondary
Sequencing: J69.0 is PDX (reason for admission). G31.87 is secondary comorbidity. J69.0 is an MCC, so DRG 091 would apply if no other PDX shifts grouping. G31.87 itself is not a CC/MCC but is clinically critical to capture for completeness and future risk adjustment monitoring.
CDI Note: The admitting provider’s documentation explicitly linking the aspiration to PPAOS is ideal and already supports the coding chain. If causation was not documented, a CDI query linking dysphagia to PPAOS would be appropriate.²⁷²
Scenario 3: Coding with Former G31.89 — Transition Pitfall
A 70-year-old male with a neurology note from September 2025 (pre-FY2026) coded as G31.89 (Other specified degenerative diseases of nervous system) for PPAOS presents for readmission in November 2025. The coder copies the previous admission’s codes, again assigning G31.89.
Correct Coding (November 2025 and Forward):
- G31.87 — Primary progressive apraxia of speech (G31.89 is no longer appropriate now that G31.87 exists)
Sequencing: G31.87 should be used for all claims with dates of service on or after October 1, 2025. Using G31.89 for a documented PPAOS diagnosis on or after FY2026 effective date is a specificity coding error.
CDI Note: This is a critical charge capture and CDI education moment. EHR diagnosis favorites, problem list entries, and coder reference tools that previously listed G31.89 for PPAOS should be updated immediately. Compliance audits of FY2026 claims may flag G31.89 as an undercoding or specificity error when G31.87 was available.¹⁵
⚠️ Coding Pitfalls and Tips
-
G31.89 Is No Longer Acceptable for PPAOS — Update All Tools Immediately. With the creation of ICD-10 CM G31.87 effective October 1, 2025, using the former workaround code G31.89 for primary progressive apraxia of speech is a coding error. ICD-10-CM specificity guidelines require the use of the most specific available code. CDI teams, coders, and EHR teams must audit any standing problem list entries, order sets, charge capture tools, or coder quick-reference guides that previously mapped PPAOS to G31.89 and update them to G31.87 before claim submission for FY2026 dates of service.¹⁵
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Do Not Conflate G31.87 with G31.01 — They Are Not Interchangeable. Primary progressive aphasia (G31.01) and primary progressive apraxia of speech (G31.87) are distinct diagnoses. G31.01 = language disorder (aphasia); G31.87 = motor speech disorder (apraxia). Many providers, nurses, and even some neurologists use the terms imprecisely in documentation. When documentation is ambiguous, query the provider before assigning either code. Assigning the wrong code misrepresents the patient’s condition, affects clinical data integrity, and may affect SLP billing and prior authorization.⁶⁹
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Do Not Add F02.x Dementia Codes to G31.87 Without Explicit Provider Documentation. The “use additional code” instruction at the G31 category level for dementia manifestation codes (F02.80-F02.C4) applies to other specified codes within G31 (G31.0-G31.83, G31.85-G31.9) but the AAPC and tabular guidance indicate G31.87 is excluded from this range for that instruction. Do not add F02.x codes unless the provider has separately and explicitly documented dementia as a comorbid condition in this patient — early PPAOS specifically preserves cognition and adding a dementia code would misrepresent the clinical picture.¹²
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Symptom Codes Are Not Appropriate Once G31.87 Is Established. Once a provider has documented primary progressive apraxia of speech as a confirmed diagnosis, do not code symptom codes such as R47.89 (Other speech disturbances) or R48.2 (apraxia) in their place. Per ICD-10-CM convention, when a definitive diagnosis has been established, symptom codes that are integral to the condition are not separately reported. G31.87 is the definitive code and supersedes any symptom-level codes for the same presentation.²
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Watch for Complication Codes That Carry CC/MCC Weight. G31.87 itself carries no CC or MCC designation and does not improve DRG weight as a secondary diagnosis. However, aspiration pneumonia (J69.0, MCC), severe malnutrition (E43, MCC), and sepsis (A41.9, MCC) are all high-probability complications in advanced PPAOS that do carry DRG-shifting weight. CDI professionals should be proactive in querying for these comorbidities during inpatient stays, as they are both clinically expected and significantly impact reimbursement.²⁵
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New Code Alert: Monitor HCC and CC/MCC Assignment in Future FY Updates. Because G31.87 is brand new as of FY2026, its HCC mapping and CC/MCC classification status should be considered provisional and subject to update. CMS may add this code to an HCC category in future V28 model updates, and the annual MS-DRG CC/MCC lists may assign it a new designation. Set a reminder to verify G31.87’s CC/MCC and HCC status in each new annual ICD-10-CM and MS-DRG release.²⁵