What is ICD-10 code F50.84?

F50.84 is the ICD-10-CM diagnosis code for Rumination disorder in adults. Rumination disorder in adults is a condition where a person repeatedly regurgitates food that has already been swallowed, re-chews it, and either swallows it again or spits it out. F50.84 is a billable code, meaning it can be reported on a claim as a primary or secondary diagnosis when supported by documentation. F50.84 is part of the FY2026 ICD-10-CM code set published by the CMS National Center for Health Statistics and used on Medicare, Medicaid, and commercial claims in the United States.

Yes. F50.84 is a billable ICD-10-CM code that can be reported on professional and institutional claims as a primary or secondary diagnosis when the provider documentation supports the specific condition described. Billable codes in ICD-10-CM are coded to the highest level of specificity available for the documented diagnosis. F50.84 is current for fiscal year 2026 and remains in the active CMS ICD-10-CM code set published by the National Center for Health Statistics.

What is the V28 vs V24 difference for F50.84?

F50.84 does not map to a payment HCC under either the CMS-HCC V28 risk adjustment model or the older V24 model. V28 reached 100% phase-in for payment year 2026, replacing V24 which was used during the PY2024–PY2025 transition. Because neither model rewards F50.84 with a risk adjustment factor, it contributes zero to a Medicare Advantage beneficiary's RAF score in either version. Coders should check whether provider documentation supports a more specific child code that does map to a payment HCC.

What should coders know when reporting F50.84?

Ensure the rumination is not secondary to another medical condition like GERD or gastroesophageal reflux; rule out organic causes first This code applies to adults; rumination disorder in children uses a different code (F98.8)

F50.84: Rumination disorder in adults — ICD-10

ICD-10-CM Code View

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Code lookupF50.84Effective periodFY2026 Apr Update (Apr 1-Sep 30)

FY 2026 Apr update / Mental, Behavioral and Neurodevelopmental disorders (F01-F99) / Behavioral syndromes associated with physiological disturbances and physical factors (F50-F59)

F50.84

Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidance

Rumination disorder in adults

Rumination disorder in adults is a condition where a person repeatedly regurgitates food that has already been swallowed, re-chews it, and either swallows it again or spits it out.

Buddy Insight

Rumination disorder in adults involves the repeated regurgitation of food for at least one month, which may be re-chewed, re-swallowed, or spit out.

CMS-HCC V28

Not risk-adjusted for this model/period.

RAF 0

CMS-HCC V24

Not risk-adjusted for this model/period.

RAF 0

ACA/HHS

Not risk-adjusted for this model/period.

RAF 0

ESRD/PACE

Not risk-adjusted for this model/period.

RAF 0

RXHCC

Mapped

HCC 133

Personality Disorders, Anxiet...

RAF 0.0

Code Trumping

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Code Book Path

Official

F50Eating disorders

F50.8Other eating disorders

F50.84Rumination disorder in adults

Inclusion Terms

Official

Rumination disorder in adults, in remission

Excludes 2

Official

ICD-10-CM does not list Excludes 2 notes for F50.84 in this effective period.

Related Child Codes

Official

F50.81Binge eating disorder

F50.82Avoidant/restrictive food intake disorder

F50.83Pica in adults

F50.89Other specified eating disorder

Includes

Official

ICD-10-CM does not list Includes notes for F50.84 in this effective period.

Excludes 1

Official

rumination disorder in infancy and childhood (F98.21)

Code First

Official

ICD-10-CM does not list Code First sequencing instructions for F50.84 in this effective period.

Use Additional

Official

ICD-10-CM does not list Use Additional Code instructions for F50.84 in this effective period.

Code Also

Official

ICD-10-CM does not list Code Also instructions for F50.84 in this effective period.

Buddy Documentation Tip

HCC Buddy guidance

Documentation of repeated regurgitation of food over at least one month

Evidence that regurgitation is not due to a gastrointestinal condition (GERD, pyloric stenosis, etc.)

Not occurring exclusively during anorexia nervosa, bulimia nervosa, binge eating disorder, or ARFID

Provider explicitly documenting rumination disorder diagnosis

MEAT Support

HCC Buddy guidance

Documentation of repeated regurgitation of food over at least one month

Evidence that regurgitation is not due to a gastrointestinal condition (GERD, pyloric stenosis, etc.)

Not occurring exclusively during anorexia nervosa, bulimia nervosa, binge eating disorder, or ARFID

Provider explicitly documenting rumination disorder diagnosis

Audit Caution

HCC Buddy guidance

Confusing rumination with self-induced vomiting in bulimia — rumination is typically effortless regurgitation, not forceful emesis

Assigning F50.84 before adequately ruling out gastroesophageal reflux disease and other gastrointestinal conditions

Missing this diagnosis when patients report 'vomiting' that is actually rumination — targeted questioning is needed

Using the infantile rumination code (F98.21) for adults instead of the correct F50.84

Common Mistakes

HCC Buddy guidance

K21.0 (Gastroesophageal reflux disease with esophagitis) — organic reflux condition, must be ruled out

F50.02x (Anorexia nervosa, binge eating/purging type) — purging involves vomiting, not rumination; different mechanism

F50.2x (Bulimia nervosa) — self-induced vomiting is intentional purging, distinct from rumination

F98.21 (Rumination disorder of infancy) — use for infantile rumination, not adults

Last updated: FY2026 ICD-10-CM Apr update, Apr 1, 2026 through Sep 30, 2026. CMS-HCC V28 is 100% phased in for payment year 2026.

Is F50.84 an HCC code?

No. F50.84 is a billable ICD-10-CM code but does not map to any HCC category in V28, V24, ESRD, or RxHCC.

HCC Category Mapping

RxHCCHCC 133, Personality Disorders, Anxiety, and Other Specified Mental Disorders

0.000

RAF weights shown are the community, non-dual, aged base weights from the CMS risk adjustment model file. Actual per-patient RAF contribution depends on member segment, interactions, and the model year used by the payer. V28 is the CMS-HCC model phased in over payment years 2024–2026; V24 remains in use during the transition and for historical data.

Work F50.84 in the Code Book — tabular path, V28 RAF, and MEAT checklist →

MEAT Criteria for F50.84

For F50.84to count as a valid HCC diagnosis in a given encounter, the provider's documentation must show MEAT: Monitor, Evaluate, Assess, or Treat. A diagnosis from a prior year does not carry forward automatically, it has to be re-documented and supported each calendar year.

MMonitor: signs, symptoms, disease progression, or lab trending documented in the note
EEvaluate: test results, medication response, or physical findings reviewed by the provider
AAssess: explicit mention in the assessment or plan with acknowledgment of status
TTreat: medication, referral, procedure, therapy, or counseling tied to the diagnosis

Only one of M/E/A/T is required to support the code, but the documentation must be specific enough to show that the provider actually addressed F50.84 during that encounter, not just copy-forwarded from a problem list.

Coder workflow notes

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What This Code Means

F50.84 is the ICD-10-CM diagnosis code for rumination disorder in adults. Rumination disorder in adults is a condition where a person repeatedly regurgitates food that has already been swallowed, re-chews it, and either swallows it again or spits it out. F50.84 sits in the ICD-10-CM chapter for mental, behavioral and neurodevelopmental disorders (f01-f99), within the section covering behavioral syndromes associated with physiological disturbances and physical factors (f50-f59).

F50.84 is a billable ICD-10-CM code but does not map to a payment HCC under the CMS-HCC V28, V24, ESRD, or RxHCC risk adjustment models. It can be reported on Medicare Advantage encounter data submissions but it does not contribute to a beneficiary's RAF score and therefore does not affect risk-adjusted payments to the plan.

F50.84 maps only to RxHCC 133 with a RAF weight of 0.000. No V28, V24, or ESRD HCC mapping exists. The direct risk adjustment impact is minimal, but associated malnutrition and weight loss may carry independent HCC value. Coders reviewing F50.84 should check whether additional documentation would support a more specific child code in the same hierarchy that does map to a payment HCC, capturing the correct specificity is the highest-impact RAF improvement available within accurate coding.

HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for F50.84 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.

Coding Tips

•Ensure the rumination is not secondary to another medical condition like GERD or gastroesophageal reflux; rule out organic causes first
•This code applies to adults; rumination disorder in children uses a different code (F98.8)

Clinical Significance

Rumination disorder in adults involves the repeated regurgitation of food for at least one month, which may be re-chewed, re-swallowed, or spit out. This is not due to gastrointestinal disease or another eating disorder. In adults, it is often underdiagnosed and can cause significant complications including malnutrition, weight loss, dental erosion, and esophageal damage.

Documentation Requirements

✓Documentation of repeated regurgitation of food over at least one month
✓Evidence that regurgitation is not due to a gastrointestinal condition (GERD, pyloric stenosis, etc.)
✓Not occurring exclusively during anorexia nervosa, bulimia nervosa, binge eating disorder, or ARFID
✓Provider explicitly documenting rumination disorder diagnosis
✓Assessment of nutritional status and associated complications

Excludes 1, Do NOT code together

rumination disorder in infancy and childhood (F98.21)

Commonly Confused Codes

•K21.0 (Gastroesophageal reflux disease with esophagitis): organic reflux condition, must be ruled out
•F50.02x (Anorexia nervosa, binge eating/purging type): purging involves vomiting, not rumination; different mechanism
•F50.2x (Bulimia nervosa): self-induced vomiting is intentional purging, distinct from rumination
•F98.21 (Rumination disorder of infancy): use for infantile rumination, not adults
•R11.10 (Vomiting, unspecified): organic vomiting, not behavioral rumination