What is ICD-10 code E89.2?

E89.2 is the ICD-10-CM diagnosis code for Postprocedural hypoparathyroidism. Low parathyroid hormone levels that develop after surgery, usually following thyroid or parathyroid procedures. It belongs to the ICD-10-CM chapter for endocrine, nutritional and metabolic diseases (e00-e89). E89.2 is a billable code, meaning it can be reported on a claim as a primary or secondary diagnosis when supported by documentation. E89.2 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. E89.2 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. E89.2 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.

Which HCC does E89.2 map to under V28?

E89.2 has no payable CMS-HCC V28 mapping in the final FY2026 CMS file.

What RAF reference is published for E89.2?

E89.2 has no V28 reference coefficient because the final FY2026 source verifies no payable V28 mapping.

What is the V28 vs V24 difference for E89.2?

E89.2 has verified no payable V28 mapping in the final FY2026 source. Select a historical effective period before making any V24 comparison.

What documentation supports E89.2?

Confirm the procedure that damaged or removed parathyroid tissue Document calcium and phosphate levels if available to support the diagnosis E89.2 is not a CMS-HCC V28 payment code in the verified current source, so MEAT is not the payment hook. Documentation still has to support the diagnosis if you report it.

Can E89.2 be a primary diagnosis?

Yes. E89.2 carries no code-first instruction in the FY2026 tabular, so it can be the first-listed diagnosis when it is the condition chiefly responsible for the encounter and the note supports it, and it can also be reported as a secondary diagnosis. For risk adjustment the order does not matter; the V28 category is the same either way.

Which codes cannot be reported with E89.2?

The Excludes1 note that applies to E89.2 lists transitory endocrine and metabolic disorders specific to newborn (P70-P74). An Excludes1 condition is not reported together with E89.2; report one or the other, unless the two conditions are unrelated, which the ICD-10-CM Official Guidelines (Section I.A.12.a) allow. The Excludes2 note lists intraoperative complications of endocrine system organ or structure (E36.0-, E36.1-, E36.8); those are separate conditions that may be reported together with E89.2 when both are documented.

2026 ICD-10-CM E89.2: Postprocedural hypoparathyroidism

E89.2 is not a CMS-HCC payment code. MEAT criteria · RAF Calculator · free HCC coding tools

ICD-10-CM Code View

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Code lookupE89.2

Effective periodFY2026 Apr Update (Apr 1-Sep 30)

FY 2026 Apr update / Endocrine, nutritional and metabolic diseases (E00-E89) / Postprocedural endocrine and metabolic complications and disorders, not elsewhere classified (E89)

E89.2

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

Postprocedural hypoparathyroidism

Low parathyroid hormone levels that develop after surgery, usually following thyroid or parathyroid procedures.

Buddy Insight

Overview Risk Models Code Book Documentation Audit Notes Edition comparison

CMS-HCC V28

N/A

—

Not risk-adjusted for this model/period.

Not mapped

CMS-HCC V24

Historical

Not used for standard CY2026 Medicare Advantage payment. Select a historical period to review V24.

Not used for CY2026 payment

ACA/HHS

Mapped

HCC 030

HHS-HCC 030 adult, RAF varies...

Code-level coefficient reference

ESRD/PACE

Mapped

HCC 23

Other Significant Endocrine a...

Code-level coefficient reference

RXHCC

Mapped

HCC 43

Pituitary, Adrenal Gland, and...

Code-level coefficient reference

Code Book Path

Official

E89Postprocedural endocrine and metabolic complications and disorders, not elsewhere classified E89.2Postprocedural hypoparathyroidism

Inclusion Terms

Official

Parathyroprival tetany

Excludes 2

Official

intraoperative complications of endocrine system organ or structure (E36.0-, E36.1-, E36.8)Inherited from E89

Related Codes

Official

E89.0Postprocedural hypothyroidism E89.1Postprocedural hypoinsulinemia E89.3Postprocedural hypopituitarism E89.4Postprocedural ovarian failure E89.5Postprocedural testicular hypofunction

Includes

Official

No Includes notes are included in this display for E89.2. Check the code and parent instructions in the Code Book.

Excludes 1

Official

transitory endocrine and metabolic disorders specific to newborn (P70-P74)Inherited from E00-E89

Code First

Official

No Code First sequencing instructions are included in this display for E89.2. Check the code and parent instructions in the Code Book.

Use Additional

Official

No Use Additional Code instructions are included in this display for E89.2. Check the code and parent instructions in the Code Book.

Code Also

Official

No Code Also instructions are included in this display for E89.2. Check the code and parent instructions in the Code Book.

Buddy Documentation Tip

HCC Buddy guidance

Diagnosis of hypoparathyroidism attributed to a prior surgical procedure

Type of procedure causing the condition (thyroidectomy, parathyroidectomy, neck dissection)

Serum calcium and PTH levels documenting hypoparathyroidism

Current supplementation regimen (calcium, calcitriol/active vitamin D)

MEAT Support

HCC Buddy guidance

Diagnosis of hypoparathyroidism attributed to a prior surgical procedure

Type of procedure causing the condition (thyroidectomy, parathyroidectomy, neck dissection)

Serum calcium and PTH levels documenting hypoparathyroidism

Current supplementation regimen (calcium, calcitriol/active vitamin D)

Audit Caution

HCC Buddy guidance

Using E20.9 (unspecified) when documentation shows post-surgical etiology

Not linking hypoparathyroidism to a prior thyroidectomy — it is a common surgical complication

Confusing temporary post-surgical hypocalcemia with permanent hypoparathyroidism

Coding only hypocalcemia (E83.51) without identifying the underlying hypoparathyroidism

Common Mistakes

HCC Buddy guidance

E20.0 — Idiopathic hypoparathyroidism: non-surgical cause

E20.1 — Pseudohypoparathyroidism: PTH resistance, not deficiency

E20.9 — Hypoparathyroidism, unspecified: use only when cause is unknown; E89.2 is required post-procedure

E89.0 — Postprocedural hypothyroidism: different endocrine gland (thyroid vs. parathyroid)

Current with CMS: FY2026 ICD-10-CM Apr 1 update (effective Apr 1 – Sep 30, 2026) · CMS-HCC V28, 100% phased in for payment year 2026. FY2027 code set already staged for October 1, 2026. How HCC Buddy stays current →

Is E89.2 an HCC code?

E89.2 is not in the CMS-HCC V28 or V24 community payment model. E89.2 has a separate mapping under the CMS-HCC ESRD model (HCC 23 (Other Significant Endocrine and Metabolic Disorders)) and the Part D RxHCC model (HCC 43 (Pituitary, Adrenal Gland, and Other Endocrine and Metabolic Disorders)); the applicable result needs member context. E89.2 also appears in the HHS-HCC commercial risk model (HCC 030 (HHS-HCC 030 adult, RAF varies by metal level)), which is a commercial market model rather than a Medicare Advantage payment mapping.

Code: E89.2
Description: Postprocedural hypoparathyroidism
HCC (V28): No CMS-HCC V28 mapping
RAF reference coefficient: —
Billable: Yes
Payment year: 2026

HCC Category Mapping

ESRDHCC 23, Other Significant Endocrine and Metabolic Disorders

Not separately weighted

RxHCCHCC 43, Pituitary, Adrenal Gland, and Other Endocrine and Metabolic Disorders

Not separately weighted

These are source-labeled model coefficients, not member totals. A category may still be removed by hierarchy or model cleanup rules. Weights are not directly comparable across models: CMS-HCC V28 and V24 use Community, Non-Dual, Aged; ESRD uses the dialysis continuing-enrollee model; RxHCC is the Part D continuing-enrollee, non-low-income, aged weight (a larger scale than CMS-HCC). ACA/HHS has no single weight — it varies by metal level. Actual per-patient RAF contribution depends on member context, hierarchy and cleanup rules, interactions, and the model year used by the payer. V28 is the CMS-HCC model phased in over payment years 2024–2026; V24 remains available for historical review.

Work E89.2 in the Code Book — tabular path, V28 RAF reference, and MEAT checklist →

MEAT review for E89.2

For E89.2, confirm that the documentation supports the diagnosis and meets the applicable coding, encounter, program and payer requirements. MEAT (Monitor, Evaluate, Assess, or Treat) is a review mnemonic, not a universal CMS coding rule.

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

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What This Code Means

E89.2 is the ICD-10-CM diagnosis code for postprocedural hypoparathyroidism. Low parathyroid hormone levels that develop after surgery, usually following thyroid or parathyroid procedures. E89.2 sits in the ICD-10-CM chapter for endocrine, nutritional and metabolic diseases (e00-e89), within the section covering postprocedural endocrine and metabolic complications and disorders, not elsewhere classified (e89).

E89.2 has no mapping under the CMS-HCC V28 or V24 community payment models. E89.2 has a separate mapping under the CMS-HCC ESRD model (HCC 23 (Other Significant Endocrine and Metabolic Disorders)) and the Part D RxHCC model (HCC 43 (Pituitary, Adrenal Gland, and Other Endocrine and Metabolic Disorders)); the applicable result needs member context. E89.2 also appears in the HHS-HCC commercial risk model (HCC 030 (HHS-HCC 030 adult, RAF varies by metal level)), which is a commercial market model rather than a Medicare Advantage payment mapping. Do not assign V28 risk adjustment value from this page; verify the applicable model and payment year before using this code for risk adjustment.

Confirm the procedure that damaged or removed parathyroid tissue.

HCC Buddy maintains structured V28 and V24 mapping, source-labeled coefficient references, and MEAT documentation criteria for E89.2 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.

Coding Tips

•Confirm the procedure that damaged or removed parathyroid tissue
•Document calcium and phosphate levels if available to support the diagnosis

Clinical Significance

Postprocedural hypoparathyroidism is the most common cause of permanent hypoparathyroidism, typically following thyroidectomy or parathyroidectomy when the parathyroid glands are inadvertently damaged or removed. It causes chronic hypocalcemia requiring lifelong calcium and vitamin D supplementation, with risk of tetany, seizures, and cardiac arrhythmias.

Documentation Requirements

✓Diagnosis of hypoparathyroidism attributed to a prior surgical procedure
✓Type of procedure causing the condition (thyroidectomy, parathyroidectomy, neck dissection)
✓Serum calcium and PTH levels documenting hypoparathyroidism
✓Current supplementation regimen (calcium, calcitriol/active vitamin D)
✓Monitoring schedule and any hypocalcemia-related complications
✓Original indication for the surgery

Commonly Confused Codes

•E20.0: Idiopathic hypoparathyroidism: non-surgical cause
•E20.1: Pseudohypoparathyroidism: PTH resistance, not deficiency
•E20.9: Hypoparathyroidism, unspecified: use only when cause is unknown; E89.2 is required post-procedure
•E89.0: Postprocedural hypothyroidism: different endocrine gland (thyroid vs. parathyroid)