2026 ICD-10-CM Diagnosis Code D21.12Benign neoplasm of connective and other soft tissue of left upper limb, including shoulder

ICD-10-CM Codes›C00–D49›D10-D36›D21

ICD-10-CM D21.12
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

D21.12 is a billable ICD-10-CM diagnosis code for benign neoplasm of connective and other soft tissue of left upper limb, including shoulder. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 564 through 566. Coders also document this condition as benign neoplasm of soft tissues of left upper extremity. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Benign neoplasms.

Code Identity

ICD-10-CM Code
D21.12
Billable Status
Yes — Valid for Submission
Code Describes
Benign neoplasm of connective and other soft tissue of left upper limb, including shoulder
Short Description
Ben neoplm of connctv/soft tiss of left upr limb, inc shldr
Parent Code
D21.1
Benign neoplasm of connective and other soft tissue of upper limb, including shoulder

Code Classification

ChapterC00–D49Neoplasms
SectionD10-D36Benign neoplasms, except benign neuroendocrine tumors
CategoryD21Other benign neoplasms of connective and other soft tissue
This CodeD21.12Benign neoplasm of connective and other soft tissue of left upper limb, including shoulder

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Benign neoplasm of soft tissues of left upper extremity

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR NEO073
Benign neoplasms
Default principal diagnosis: inpatient Yes · outpatient Yes

Table of NeoplasmsClinical

Anatomical sites in the Table of Neoplasms that reference this code family.

SiteMalig.
Primary		Malig.
Secondary		Ca
in situ		BenignUncertainUnspec.
aponeurosis › palmarC49.1C79.89–D21.1D48.1D49.2
connective tissue NEC › antecubital fossa or spaceC49.1C79.89–D21.1D48.1D49.2
connective tissue NEC › armC49.1C79.89–D21.1D48.1D49.2
connective tissue NEC › elbowC49.1C79.89–D21.1D48.1D49.2
connective tissue NEC › extremity › upperC49.1C79.89–D21.1D48.1D49.2
connective tissue NEC › fingerC49.1C79.89–D21.1D48.1D49.2
connective tissue NEC › forearmC49.1C79.89–D21.1D48.1D49.2
connective tissue NEC › handC49.1C79.89–D21.1D48.1D49.2
connective tissue NEC › limb NEC › upperC49.1C79.89–D21.1D48.1D49.2
connective tissue NEC › shoulderC49.1C79.89–D21.1D48.1D49.2
connective tissue NEC › thumbC49.1C79.89–D21.1D48.1D49.2
connective tissue NEC › wristC49.1C79.89–D21.1D48.1D49.2
fascia [See Also: Neoplasm, connective tissue]C49.1C79.89–D21.1D48.1D49.2
fascia [See Also: Neoplasm, connective tissue] › palmarC49.1C79.89–D21.1D48.1D49.2

Patient EducationClinical

Benign Tumors

Tumors are abnormal growths in your body. They can be either benign or malignant. Benign tumors aren't cancer. Malignant ones are. Benign tumors grow only in one place. They cannot spread or invade other parts of your body. Even so, they can be dangerous if they press on vital organs, such as your brain.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert D21.12 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
215.2 Ben neo soft tissue arm
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About D21.12Overview

Is D21.12 a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report benign neoplasm of connective and other soft tissue of left upper limb, including shoulder on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does D21.12 group to?

When benign neoplasm of connective and other soft tissue of left upper limb, including shoulder is the principal diagnosis on an inpatient stay, it groups to MS-DRG 564, 565, 566, with relative weights from 0.7493 to 1.5436 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of D21.12?

Under the General Equivalence Mappings, benign neoplasm of connective and other soft tissue of left upper limb, including shoulder converts to ICD-9-CM 215.2 (ben neo soft tissue arm). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.