2027 ICD-10-CM Diagnosis Code E88.89Other specified metabolic disorders
ICD-10-CM Codes›E00–E89›E70-E88›E88
- Billable — Valid for Submission
- Risk Adjusts — HCC 50
- Chronic Condition
E88.89 is a billable ICD-10-CM diagnosis code for other specified metabolic disorders. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 642. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified and unspecified nutritional and metabolic disorders.
For Medicare Advantage risk adjustment, E88.89 maps to CMS-HCC Category 50 (Amyloidosis, Porphyria, and Other Specified Metabolic Disorders) under the V28 model, adding a risk factor of about 0.648 for a community, non-dual, aged beneficiary in payment year 2027.
Code Identity
Code Classification
Medicare Risk Adjustment (HCC)Billing
E88.89 maps to a payment category in the CMS-HCC model used to risk-adjust Medicare Advantage payments. Weights are the published community factors for payment year 2027.
Source: CMS Payment Year 2027 risk adjustment mappings and model software. Weights are relative factors, not dollar amounts; a beneficiary's total RAF also includes demographics and interactions. Browse all CMS-HCC categories.
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Adenosine deaminase overproduction
- Amino acid deficiency
- Angioedema due to disorder of kinin metabolism
- Aromatase excess syndrome
- Arylsulfatase deficiency without MLD
- Autosomal recessive ataxia due to ubiquinone deficiency
- Autosomal recessive distal hereditary motor neuropathy
- Brunner syndrome
- Carnitine deficiency
- Carnitine deficiency due to inborn error of metabolism
- Central nervous system dysfunction in newborn
- Cerebral folate transport deficiency
- Chronic diarrhea due to glucoamylase deficiency
- Chronic diarrhea of infants AND/OR young children
- Chronic infantile diarrhea due to guanylate cyclase 2C overactivity
- Circulating enzyme deficiency
- Clinical manifestation of enzyme deficiency
- Coenzyme Q10 deficiency
- Complete deficiency of methylmalonyl-CoA mutase
- Congenital defect of folate absorption
- COQ7 gene related distal hereditary motor neuropathy
- Corticosteroid 11-reductase deficiency
- CYP2B6 poor metabolizer
- CYP2B6 rapid metabolizer
- CYP2B6 ultra-rapid metabolizer
- CYP2C19 poor metabolizer
- CYP2C19 ultrarapid metabolizer
- CYP2C9 poor metabolizer
- CYP2D6 poor metabolizer
- CYP2D6 ultra-rapid metabolizer
- CYP3A5 poor metabolizer
- Cytochrome p450 CYP1A2 enzyme deficiency
- Cytochrome p450 CYP2E1 enzyme deficiency
- Cytochrome p450 CYP3A enzyme deficiency
- Cytochrome p450 enzyme deficiency
- Cytosolic acetoacetyl-CoA thiolase deficiency
- Decreased metabolic requirement
- Decreased oxygen affinity
- Deficiency of 1,3-beta-glucan synthase
- Deficiency of 1,4-alpha-glucan 6alpha-glucosyltransferase
- Deficiency of 1,4-alpha-glucan branching enzyme
- Deficiency of 2,5-diaminovalerate aminotransferase
- Deficiency of -20-hydroxysteroid dehydrogenase
- Deficiency of -2-hydroxy-acid oxidase
- Deficiency of 3alpha-hydroxycholanate dehydrogenase
- Deficiency of 3-mercaptopyruvate sulfurtransferase
- Deficiency of 3-oxoacid CoA-transferase
- Deficiency of 3-oxoadipate CoA-transferase
- Deficiency of acetate kinase
- Deficiency of acetylcholinesterase
- Deficiency of acetyl-CoA acetyltransferase
- Deficiency of acetylesterase
- Deficiency of acid-ammonia ligase
- Deficiency of aconitate hydratase
- Deficiency of adenosine kinase
- Deficiency of adenosinetriphosphatase
- Deficiency of adenylate kinase
- Deficiency of adenylylsulfate kinase
- Deficiency of ADP deaminase
- Deficiency of alcohol sulfotransferase
- Deficiency of aldehyde dehydrogenase
- Deficiency of aldehyde oxidase
- Deficiency of aldehyde-lyase
- Deficiency of alkaline phosphatase
- Deficiency of alkaline phosphomonoesterase
- Deficiency of alkylhalidase
- Deficiency of alpha- and beta-trypsin
- Deficiency of alpha-1,4-glucan-protein synthase
- Deficiency of alpha-aminoacylpeptide hydrolase
- Deficiency of alpha-ketoglutarate dehydrogenase
- Deficiency of amidase
- Deficiency of amidinotransferase
- Deficiency of amidophosphoribosyltransferase
- Deficiency of amine oxidase
- Deficiency of aryl sulfotransferase
- Deficiency of arylamine acetyltransferase
- Deficiency of arylesterase
- Deficiency of aspartic proteinase
- Deficiency of ATP pyrophosphatase
- Deficiency of azobenzene reductase
- Deficiency of butyrate-acetoacetate CoA-transferase
- Deficiency of butyrylcholinesterase
- Deficiency of carbamate kinase
- Deficiency of carbon-carbon lyase
- Deficiency of carbon-halide lyase
- Deficiency of carbon-nitrogen lyase
- Deficiency of carbon-oxygen lyase
- Deficiency of carbon-sulfur lyase
- Deficiency of carboxylesterase
- Deficiency of carboxylic ester hydrolase
- Deficiency of catechol oxidase
- Deficiency of cathepsin C
- Deficiency of cathepsin D
- Deficiency of cellulase
- Deficiency of chlorophyllase
- Deficiency of choline acetyltransferase
- Deficiency of choline kinase
- Deficiency of choline-phosphate cytidylyltransferase
- Deficiency of cholinephosphotransferase
- Deficiency of chymosin
- Deficiency of chymotrypsin
- Deficiency of chymotrypsin A and B
- Deficiency of citrate-synthase
- Deficiency of creatine kinase
- Deficiency of cytosol non-specific dipeptidase
- Deficiency of D-2-hydroxy-acid dehydrogenase
- Deficiency of dehydrogenase
- Deficiency of dehydrogluconate dehydrogenase
- Deficiency of dehydrogluconokinase
- Deficiency of deoxyribonuclease I
- Deficiency of deoxyribonuclease II
- Deficiency of dephospho-CoA kinase
- Deficiency of dextranase
- Deficiency of dihydroorotase
- Deficiency of diisopropyl-fluorophosphatase
- Deficiency of dimethylallyltranstransferase
- Deficiency of dioxygenase
- Deficiency of dipeptidase
- Deficiency of dipeptide hydrolase
- Deficiency of dipeptidylpeptide hydrolase
- Deficiency of diphosphomevalonate decarboxylase
- Deficiency of diphosphoric monoester hydrolase
- Deficiency of DNA nucleotidylexotransferase
- Deficiency of DNA-directed DNA polymerase
- Deficiency of DNA-directed RNA polymerase
- Deficiency of endopeptidase
- Deficiency of endoribonuclease
- Deficiency of enolase
- Deficiency of enteropeptidase
- Deficiency of epimerase
- Deficiency of erythritol kinase
- Deficiency of estradiol 6beta-monooxygenase
- Deficiency of ethanolamine-phosphate cytidylyltransferase
- Deficiency of ethanolaminephosphotransferase
- Deficiency of ether hydrolase
- Deficiency of exoribonuclease
- Deficiency of FMN adenylyltransferase
- Deficiency of formaldehyde dehydrogenase
- Deficiency of formamidase
- Deficiency of formate dehydrogenase
- Deficiency of formate-tetrahydrofolate ligase
- Deficiency of formiminotetrahydrofolate cyclodeaminase
- Deficiency of formyltetrahydrofolate deformylase
- Deficiency of fumarylacetoacetase
- Deficiency of galactonolactone dehydrogenase
- Deficiency of glucosamine acetyltransferase
- Deficiency of glucosamine kinase
- Deficiency of glucosamine-phosphate acetyltransferase
- Deficiency of glutathione reductase
- Deficiency of glycerate kinase
- Deficiency of glycerol-3-phosphate acyltransferase
- Deficiency of glycerophosphatase
- Deficiency of glycogen synthase a kinase
- Deficiency of guanine deaminase
- Deficiency of guanylate cyclase 2C
- Deficiency of heparin lyase
- Deficiency of hexose oxidase
- Deficiency of hexosyltransferase
- Deficiency of histidinol dehydrogenase
- Deficiency of hyaluronate lyase
- Deficiency of hyaluronoglucosaminidase
- Deficiency of hydrogen-sulfide acetyltransferase
- Deficiency of hydrolase
- Deficiency of hydrolyase
- Deficiency of hydroxyacylglutathione hydrolase
- Deficiency of hydroxyalkyl-protein kinase
- Deficiency of hydroxymethylglutaryl-CoA hydrolase
- Deficiency of hydroxymethylglutaryl-CoA reductase
- Deficiency of hydroxymethylglutaryl-CoA synthase
- Deficiency of IMP cyclohydrolase
- Deficiency of IMP dehydrogenase
- Deficiency of inorganic pyrophosphatase
- Deficiency of isobutyryl-CoA dehydrogenase
- Deficiency of isocitrate lyase
- Deficiency of isomerase
- Deficiency of isopentenyl-diphosphate delta-isomerase
- Deficiency of ketotetrose-phosphate aldolase
- Deficiency of lactonase
- Deficiency of lactoylglutathione lyase
- Deficiency of L-arabinose dehydrogenase
- Deficiency of leucine aminopeptidase
- Deficiency of leukotriene C4 synthase
- Deficiency of L-gulonate dehydrogenase
- Deficiency of lichenase
- Deficiency of ligase
- Deficiency of limit dextrinase
- Deficiency of lyase
- Deficiency of lysine-tRNA ligase
- Deficiency of lysolecithin acylmutase
- Deficiency of lysophospholipase
- Deficiency of lysostaphin
- Deficiency of lysozyme
- Deficiency of malate dehydrogenase
- Deficiency of mannitol dehydrogenase
- Deficiency of mannose-6-phosphate isomerase
- Deficiency of metallocarboxypeptidase
- Deficiency of metalloproteinase
- Deficiency of methenyltetrahydrofolate cyclohydrolase
- Deficiency of methylaspartate mutase
- Deficiency of methylenetetrahydrofolate dehydrogenase
- Deficiency of methylglutaconyl-CoA hydratase
- Deficiency of methylmalonyl-CoA mutase
- Deficiency of methylmalonyl-coenzyme A epimerase
- Deficiency of methyltransferase
- Deficiency of mevaldate reductase
- Deficiency of mevalonate kinase
- Deficiency of monoamine oxidase
- Deficiency of monodehydroascorbate reductase
- Deficiency of monooxygenase
- Deficiency of mutase
- Deficiency of myo-inositol oxygenase
- Deficiency of N-acetyl-beta-glucosaminidase
- Deficiency of N-acetylneuraminate lyase
- Deficiency of NAD
- Deficiency of NAD^+^ kinase
- Deficiency of NAD^+^ nucleosidase
- Deficiency of NAD^+^ synthase
- Deficiency of NAD^+^ transhydrogenase
- Deficiency of NADase
- Deficiency of NADH dehydrogenase
- Deficiency of nicotinamide methyltransferase
- Deficiency of nicotinamide phosphoribosyltransferase
- Deficiency of nicotinamide-nucleotide adenylyltransferase
- Deficiency of nicotinate dehydrogenase
- Deficiency of nicotinate phosphoribosyltransferase
- Deficiency of nucleosidase
- Deficiency of nucleoside-diphosphatase
- Deficiency of nucleoside-diphosphate kinase
- Deficiency of nucleoside-phosphate kinase
- Deficiency of nucleotidase
- Deficiency of nucleotide pyrophosphatase
- Deficiency of nucleotidyltransferase
- Deficiency of omega peptidase
- Deficiency of orotate phosphoribosyltransferase
- Deficiency of oxalate CoA-transferase
- Deficiency of oxidase
- Deficiency of oximinotransferase
- Deficiency of oxo-acid-lyase
- Deficiency of oxoglutarate dehydrogenase
- Deficiency of oxygenase
- Deficiency of pancreatic elastase
- Deficiency of pantetheine kinase
- Deficiency of pantetheine-phosphate adenylyltransferase
- Deficiency of pantothenoylcysteine decarboxylase
- Deficiency of pentosyltransferase
- Deficiency of pepsin A
- Deficiency of pepsin B
- Deficiency of peptide hydrolase
- Deficiency of peroxidase
- Deficiency of phenylalanine 4-monooxygenase
- Deficiency of phenylpyruvate tautomerase
- Deficiency of phosphatase
- Deficiency of phosphatidate phosphatase
- Deficiency of phosphoacetylglucosamine mutase
- Deficiency of phosphoadenylate 3'-nucleotidase
- Deficiency of phosphoamidase
- Deficiency of phosphoglucomutase
- Deficiency of phosphogluconate dehydrogenase
- Deficiency of phosphoglycerate mutase
- Deficiency of phosphoketolase
- Deficiency of phospholipase A>2<
- Deficiency of phospholipase C
- Deficiency of phospholipase D
- Deficiency of phosphomevalonate kinase
- Deficiency of phosphopantothenate-cysteine ligase
- Deficiency of phosphoprotein phosphatase
- Deficiency of phosphoribokinase
- Deficiency of phosphoribosylamine-glycine ligase
- Deficiency of phosphoribosylglycinamide formyltransferase
- Deficiency of phosphoric diester hydrolase
- Deficiency of phosphoric monoester hydrolase
- Deficiency of phosphorus-oxygen lyase
- Deficiency of phosphorylase kinase
- Deficiency of phosphorylase phosphatase
- Deficiency of phosphotransferase
- Deficiency of plasmin
- Deficiency of polygalacturonase
- Deficiency of polyribonucleotide nucleotidyltransferase
- Deficiency of progesterone 11alpha-monooxygenase
- Deficiency of protease
- Deficiency of protein kinase
- Deficiency of protocatechuate 3,4-dioxygenase
- Deficiency of pyridoxal kinase
- Deficiency of pyridoxamine-phosphate oxidase
- Deficiency of pyrophosphotransferase
- Deficiency of pyrroline-2-carboxylate reductase
- Deficiency of pyruvate kinase
- Deficiency of racemase
- Deficiency of reductase
- Deficiency of renin
- Deficiency of retinal isomerase
- Deficiency of riboflavin kinase
- Deficiency of ribokinase
- Deficiency of ribonuclease
- Deficiency of ribose-5-phosphate isomerase
- Deficiency of ribose-phosphate pyrophosphokinase
- Deficiency of ribosomal cathepsin
- Deficiency of ribosomal neutral proteinase
- Deficiency of ribosylnicotinamide kinase
- Deficiency of ribulokinase
- Deficiency of ribulose-phosphate 3-epimerase
- Deficiency of sarcoplasmic reticulum calcium-ATPase 1
- Deficiency of sedoheptulokinase
- Deficiency of serine proteinase
- Deficiency of shikimate dehydrogenase
- Deficiency of sialidase
- Deficiency of squalene monooxygenase
- Deficiency of steroid 17-alpha-monooxygenase
- Deficiency of steroid delta-isomerase
- Deficiency of succinate dehydrogenase
- Deficiency of succinate-CoA ligase
- Deficiency of succinyl-CoA hydrolase
- Deficiency of sulfate adenylyltransferase
- Deficiency of sulfinoalanine decarboxylase
- Deficiency of sulfite reductase
- Deficiency of sulfotransferase
- Deficiency of sulfuric ester hydrolase
- Deficiency of sulfurtransferase
- Deficiency of tannase
- Deficiency of thiamine pyridinylase
- Deficiency of thiamine pyrophosphokinase
- Deficiency of thioethanolamine acetyltransferase
- Deficiency of thioether hydrolase
- Deficiency of thiolester hydrolase
- Deficiency of thiosulfate sulfurtransferase
- Deficiency of thrombin
- Deficiency of transacylase
- Deficiency of transaldolase
- Deficiency of transcarbamoylase
- Deficiency of transcarboxylase
- Deficiency of transferase
- Deficiency of transformiminase
- Deficiency of transformylase
- Deficiency of transketolase
- Deficiency of triacylglycerol lipase
- Deficiency of tripeptide aminopeptidase
- Deficiency of triphosphoric monoester hydrolase
- Deficiency of tropinesterase
- Deficiency of trypsin
- Deficiency of tyrosine aminotransferase
- Deficiency of UDPglucose dehydrogenase
- Deficiency of unspecific monooxygenase
- Deficiency of uracil dehydrogenase
- Deficiency of uracil phosphoribosyltransferase
- Deficiency of uronolactonase
- Deficiency of UTP-glucose-1-phosphate uridylyltransferase
- Deficiency of UTP-hexose-1-phosphate uridylyltransferase
- Deficiency of w-amidase
- Deficiency of Xaa-Pro dipeptidase
- Deficiency of xylan endo-1,3-beta-xylosidase
- Deficiency of Zeta-chain associated protein kinase 70
- Diffuse organ or tissue uptake
- Dilated cardiomyopathy due to familial storage disease
- Dilated cardiomyopathy due to lysosomal storage disease
- Dilated cardiomyopathy due to metabolic disorder
- Disorder due to N-acetyltransferase enzyme variant
- Disorder of beta and omega amino acid metabolism
- Disorder of blood gas
- Disorder of cortisol-cortisone shuttle
- Disorder of gamma aminobutyric acid metabolism
- Disorder of iodine metabolism
- Disorder of lysosomal enzyme
- Disorder of organic acid metabolism
- Disorder of oxygen transport
- Disorder of propionate AND/OR methylmalonate metabolism
- Disorder of protein metabolism
- Disorder of sialic acid metabolism
- Disorder of steroid metabolism
- DPYD poor metabolizer
- Epsilon-N-trimethyllysine hydroxylase carnitine deficiency disorder
- Erythrocyte enzyme deficiency
- Ethanolaminosis
- Etiocholanolone fever
- Folic acid deficiency
- Folinic acid responsive developmental and epileptic encephalopathy
- Fumarate hydratase deficiency
- Fumarylacetoacetase deficiency, acute type
- Glucose phosphate isomerase deficiency
- Glutathione S-transferase deficiency
- Hyperimidodipeptiduria
- Hypermetabolism
- Hypermethioninemia
- Hyperthermia-hyperphagia-hypothyroidism syndrome
- Hypertrophic cardiomyopathy due to lysosomal disease
- Impaired oxygen delivery
- Impaired oxygen extraction
- Increased auto-oxidation
- Increased metabolic requirement
- Increased oxygen affinity
- Increased oxygen demand
- Inherited disorder of folate metabolism
- Intestinal enteropeptidase deficiency
- Intestinal obstruction in newborn due to guanylate cyclase 2C deficiency
- Ketoacidosis due to monocarboxylate transporter-1 deficiency
- Ketonemia
- Ketosis
- Ketotic hypoglycemia
- Liposynovitis prepatellaris
- Lipoyl transferase 2 deficiency
- Meconium ileus
- Metabolic disorder of transport
- Metabolic myopathy due to lactate transporter defect
- Methylcrotonic aciduria
- Methylmalonate semialdehyde dehydrogenase deficiency
- Mevalonic aciduria
- Mitochondrial 2-methylacetoacetyl-CoA thiolase deficiency - non-potassium stimulated
- Mucolipidosis
- Muscle D-lactate dehydrogenase deficiency
- NADHX dehydratase deficiency
- NADHX epimerase deficiency
- Neonatal obstruction of intestine
- Non-amino organic acidemia AND/OR aciduria
- NUDT15 intermediate metabolizer
- NUDT15 poor metabolizer
- NUDT15 possible intermediate metabolizer
- Pancreatic colipase deficiency
- Pancreatic malabsorption
- Partial deficiency of methylmalonyl-CoA mutase
- Patchy organ or tissue uptake
- Pentose disorder
- Perinatal intestinal obstruction
- Prepatellar bursitis
- Progressive polyneuropathy with bilateral striatal necrosis
- Progressive retinal dystrophy due to retinol transport defect
- Proteinosis
- Pseudohypoaldosteronism
- Pseudohypoaldosteronism type 2A
- Pseudohypoaldosteronism, type 1
- Pseudohypoaldosteronism, type 1, dominant form
- Pseudohypoaldosteronism, type 1, recessive form
- Pseudohypoaldosteronism, type 2
- Psychomotor retardation due to S-adenosylhomocysteine hydrolase deficiency
- Pyridoxine-dependent developmental and epileptic encephalopathy
- Rowley-Rosenberg syndrome
- S-adenosylhomocysteine hydrolase deficiency
- Secondary carnitine deficiency
- Short stature, developmental delay, congenital heart defect syndrome
- Sialic acid storage disease, severe infantile type
- Sialic storage disease
- Sialuria
- SLCO1B1 decreased function
- SLCO1B1 poor function
- Specific enzyme deficiency
- Steatosis
- Steroid dehydrogenase deficiency and dental anomaly syndrome
- Testosterone 17-beta-dehydrogenase deficiency
- TPMT poor metabolizer
- Transient pseudohypoaldosteronism
- Trypsinogen deficiency
- UGT1A1 poor metabolizer
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to E88.89: its own notes plus those printed at E88, block E70-E88, and Chapter 4. A note printed at a category, block or chapter applies to every code under it.
Applicable To
Conditions this code is used for: synonyms of the title or, for "other specified" codes, the conditions assigned to it. The list is not exhaustive.
- Launois-Bensaude adenolipomatosis
Excludes1
Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.
- adult pulmonary Langerhans cell histiocytosis (J84.82)
- histiocytosis X (chronic) (C96.6)
Excludes2
Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.
- Ehlers-Danlos syndromes (Q79.6-)
Use Additional Code
Add a second code, after this one, to fully describe the condition.
- codes for associated conditions
Notes
General instructions on how these codes are used.
- All neoplasms, whether functionally active or not, are classified in Chapter 2. Appropriate codes in this chapter (i.e. E05.8, E07.0, E16-E31, E34.-) may be used as additional codes to indicate either functional activity by neoplasms and ectopic endocrine tissue or hyperfunction and hypofunction of endocrine glands associated with neoplasms and other conditions classified elsewhere.
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
Disease, diseased See Also: Syndrome;
Erdheim-Chester (ECD) E88.89
Disorder (of) See Also: Disease;
specified NEC E88.89
Hoffa-Kastert disease E88.89
Hoffa's disease E88.89
Ketosis NEC E88.89
Launois-Bensaude E88.89
Liposynovitis prepatellaris E88.89
Steatosis E88.89
Syndrome See Also: Disease;
Erdheim-Chester (ECD) E88.89
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Patient EducationClinical
Metabolic Disorders
Metabolism is the process your body uses to get or make energy from the food you eat. Food is made up of proteins, carbohydrates, and fats. Chemicals in your digestive system break the food parts down into sugars and acids, your body's fuel.
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert E88.89 to ICD-9-CMHistory
Code HistoryHistory
Questions About E88.89Overview
What is the ICD-10 code for other specified metabolic disorders?
The ICD-10-CM code for other specified metabolic disorders is E88.89 (sometimes written as E8889). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is E88.89 (Other specified metabolic disorders) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report other specified metabolic disorders on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does E88.89 group to?
When other specified metabolic disorders is the principal diagnosis on an inpatient stay, it groups to MS-DRG 642 (inborn and Other Disorders of Metabolism), which carries a relative weight of 1.3226. Higher weights mean higher Medicare reimbursement.
Can E88.89 be reported with J84.82?
Not as a rule. The Excludes1 note on E88.89 lists "adult pulmonary Langerhans cell histiocytosis (J84.82)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).
Does E88.89 need an additional code?
When the condition applies, yes. The Use Additional Code note at E88, which applies to E88.89, reads: codes for associated conditions. The additional code is reported after E88.89.
What HCC is E88.89?
E88.89 (other specified metabolic disorders) maps to CMS-HCC Category 50 (Amyloidosis, Porphyria, and Other Specified Metabolic Disorders), commonly written as HCC 50, in the CMS-HCC V28 model used for Medicare Advantage risk adjustment in payment year 2027. It mapped to HCC 23 under the retired V24 model. It also maps in the PACE (CMS-HCC V22), ESRD (V21), and ESRD (V24) models. In the Part D prescription drug model it maps to RxHCC 43.
Does E88.89 risk-adjust for Medicare Advantage payment?
Yes. When documented and reported on a Medicare Advantage encounter, E88.89 adds a risk adjustment factor of about 0.648 to the beneficiary's RAF score for a community, non-dual, aged enrollee (published V28 weights range from 0.362 to 0.883 depending on the payment segment). HCC 50 sits at the top of its hierarchy, so no other condition category supersedes it. See the full factor table on the HCC 50 category page.