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ICD-10-CM 2027 diagnosis code

R29.0Tetany

✓ Billable / specificCC — complication/comorbidity

R29.0 is a valid, billable ICD-10-CM code for tetany. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.

Looking up by condition? See ICD-10 code for Tetany, ICD-10 code for Pseudotetany.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About R29.0

R29.0 is the ICD-10-CM diagnosis code for tetany. It belongs to category R29 (other symptoms and signs involving the nervous and musculoskeletal systems), block R25-R29 (symptoms and signs involving the nervous and musculoskeletal systems) and chapter 18 (symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Within R29 (other symptoms and signs involving the nervous and musculoskeletal systems), R29.0 is specifically for tetany. Related codes cover Meningismus (R29.1), abnormal reflex (R29.2), abnormal posture (R29.3), Clicking hip (R29.4), transient paralysis (R29.5), repeated falls (R29.6), National Institutes of Health Stroke Scale (NIHSS) score (R29.7), other symptoms and signs involving the nervous and musculoskeletal systems (R29.8) and 1 more.

Don't report R29.0 together with the conditions in its Excludes1 note: hysterical tetany (F44.5), neonatal tetany (P71.3), parathyroid tetany (E20.9) and post-thyroidectomy tetany (E89.2).

As a secondary diagnosis it is a CC (complication or comorbidity), which can move an inpatient stay into the "with CC" MS-DRG of its family, unless the principal diagnosis excludes it.

In MS-DRG v44.0, it is part of the grouping logic for DRG 640 (Miscellaneous Disorders of Nutrition, Metabolism, Fluids and Electrolytes with MCC, relative weight 1.3395), DRG 641 (Miscellaneous Disorders of Nutrition, Metabolism, Fluids and Electrolytes without MCC, relative weight 0.7865), DRG 791 (Prematurity with Major Problems, relative weight 4.1075) and DRG 793 (Full Term Neonate with Major Problems, relative weight 4.2195), in MDC 10 (Endocrine, Nutritional and Metabolic Diseases and Disorders) and MDC 15 (Newborns and Other Neonates with Conditions Originating in the Perinatal Period), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Before ICD-10, this condition was coded in ICD-9-CM as 781.7 (tetany).

Coding notes

Applicable toConditions and synonyms classified to this code
  • Carpopedal spasm
Excludes1Not coded here — never report together with this code
  • hysterical tetany (F44.5)
  • neonatal tetany (P71.3)
  • parathyroid tetany (E20.9)
  • post-thyroidectomy tetany (E89.2)

Notes that apply from higher levels

Instructions written at a parent level also apply to R29.0.

Broader instructions also apply from Chapter 18: Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified.

Alphabetic index entries

7 entries

Terms in the official ICD-10-CM index that lead to R29.0.

Codes whose notes reference R29.0

MS-DRG v44.0 grouping

All DRGs →

Inpatient MS-DRGs this diagnosis can group to, as the principal or a secondary diagnosis, depending on the rest of the claim.

MDC 15 · Newborns and Other Neonates with Conditions Originating in the Perinatal Period

MDC 15 · Newborns and Other Neonates with Conditions Originating in the Perinatal Period

ICD-9-CM equivalent

Converter →

From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about R29.0

Is R29.0 billable?

Yes. R29.0 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can R29.0 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict R29.0 as a principal diagnosis.

Is R29.0 a CC or MCC?

R29.0 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.

What DRG does R29.0 group to?

R29.0 is used in the MS-DRG v44.0 logic for MS-DRG 640 (Miscellaneous Disorders of Nutrition, Metabolism, Fluids and Electrolytes with MCC), MS-DRG 641 (Miscellaneous Disorders of Nutrition, Metabolism, Fluids and Electrolytes without MCC), MS-DRG 791 (Prematurity with Major Problems) and MS-DRG 793 (Full Term Neonate with Major Problems). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.

What is the ICD-9 code for R29.0?

The CMS General Equivalence Mappings map R29.0 to ICD-9-CM 781.7.