6A221ZZElectromagnetic Therapy, Central Nervous, Multiple

Extracorporeal or Systemic Therapies›Physiological Systems›Electromagnetic Therapy

Billable / Specific Code

ICD-10-PCS 6A221ZZ

CMS Source: FY 2027 ICD-10-PCS dataset. Effective Oct 1, 2026 – Sep 30, 2027.

6A221ZZ is a billable ICD-10-PCS procedure code for Electromagnetic Therapy, Central Nervous, Multiple. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027). The root operation Electromagnetic Therapy involves extracorporeal treatment by electromagnetic rays. In AHRQ's Clinical Classifications Software (CCSR), this procedure falls under Extracorporeal or systemic therapies, NEC.

Code Identity

ICD-10-PCS Code

6A221ZZ

Billable Status

Yes — Valid for Submission

Code Describes

Electromagnetic Therapy, Central Nervous, Multiple

Short Description

Electromagnetic Therapy, Central Nervous, Multiple

Same as the full description in the CMS dataset.

Parent Code

6A2 Extracorporeal or Systemic Therapies, Physiological Systems, Electromagnetic Therapy

PCS Table Breakdown

Each ICD-10-PCS code is built from seven characters, each an axis of the procedure. Hover or tap the icons for the official CMS definitions.

Position	Designation	Value	Meaning
1	Section	6	Extracorporeal or Systemic Therapies
2	Body System	A	Physiological Systems
3	Operation	2	Electromagnetic Therapy
4	BodySystem	2	Central Nervous
5	Duration	1	Multiple
6	Qualifier	Z	No Qualifier
7	Qualifier	Z	No Qualifier

In the ICD-10-PCS Alphabetic Index

These FY 2027 ICD-10-PCS Alphabetic Index entries lead to this code:

Electromagnetic Therapy, Central Nervous

Leads to this code's table

To code electromagnetic therapy of the central nervous, open the FY 2027 ICD-10-PCS Alphabetic Index at Electromagnetic Therapy, then the subterm Central Nervous. The index leads to table 6A2, where the duration, qualifier and qualifier values shown in the breakdown above complete the seven-character code 6A221ZZ.

Browse the full ICD-10-PCS Alphabetic Index →

Clinical Classification (CCSR)

AHRQ groups this procedure code into these clinical categories.

EST005

Extracorporeal or systemic therapies, NEC

Clinical domain: Extracorporeal or Systemic Therapies

Convert to ICD-9-PCS

Closest ICD-9-PCS equivalents for this code under the General Equivalence Mappings.

99.99

Other miscellaneous procedures

Approximate match.

Code History

Replaced in the FY 2027 code set by:

X0Z0X18 — Computer-assisted TMS of Prefrontal Cortex, New Tech 8

Similar Procedure Codes

Questions About 6A221ZZ

Is 6A221ZZ a billable code?

Yes. This is a complete seven-character ICD-10-PCS code, specific enough to report Electromagnetic Therapy, Central Nervous, Multiple on inpatient claims from October 1, 2026 through September 30, 2027.

What do the characters in 6A221ZZ mean?

The code breaks down character by character: the 1st character 6 is the Section (Extracorporeal or Systemic Therapies); the 2nd character A is the Body System (Physiological Systems); the 3rd character 2 is the Operation (Electromagnetic Therapy); the 4th character 2 is the BodySystem (Central Nervous); the 5th character 1 is the Duration (Multiple); the 6th character Z is the Qualifier (No Qualifier); the 7th character Z is the Qualifier (No Qualifier).

What is the ICD-9-PCS equivalent of 6A221ZZ?

Under the General Equivalence Mappings, Electromagnetic Therapy, Central Nervous, Multiple crosswalks to ICD-9-PCS 99.99 (Other miscellaneous procedures). The mapping is approximate, so confirm it fits the documentation.