Key facts for NCD 190.3
- Benefit category
- Diagnostic Tests (other)
- Effective date
- 07/16/1998
- Transmittal
- Transmittal 105
- Versions published
- 1
- Manual chapter
- 190
- NCD Manual (Pub. 100-03)
TL;DR
NCD 190.3 sets Medicare's national policy for cytogenetic studies under the benefit category "Diagnostic Tests (other)", effective 07/16/1998. Medicare covers these tests when they are reasonable and necessary for the diagnosis or treatment of the following conditions: It has been revised once since publication and binds every Medicare Administrative Contractor nationally.
Item or service described
The term cytogenetic studies is used to describe the microscopic examination of the physical appearance of human chromosomes.
Indications and limitations of coverage
Medicare covers these tests when they are reasonable and necessary for the diagnosis or treatment of the following conditions:
• Genetic disorders (e.g., mongolism) in a fetus; (See the Medicare Benefit Policy Chapter 15, "Covered Medical and Other Health Services," §20.1)
• Failure of sexual development;
• Chronic myelogenous leukemia;
• Acute leukemias lymphoid (FAB L1-L3), myeloid (FAB M0-M7), and unclassified; or
• Mylodysplasia
Text reproduced from the CMS Medicare Coverage Database record for NCD 190.3 version 1. View the original on cms.gov.
Revision history
08/2026 - Transmittal 13903 issued August 07, 2026, is being rescinded and replaced by Transmittal 13923, dated August 14, 2026, to update NCD 20.4 Implantable Cardioverter Defibrillator (ICD) to include additional business requirements for Place of Service (POS) and Claim Adjustment Reason Code (CARC) and Remittance Advice Remark Code (RARC) messages. All other information remains the same. ( TN 13923 ) (CR14570)
08/2026 - The purpose of this Change Request (CR) is to provide a quarterly maintenance update of ICD-10 coding conversions and other coding updates specific to National Coverage Determinations (NCDs). No policy is being changed as a result of these updates. ( TN 13903 ) (CR14570)
09/2025 - Transmittal 13400 issued September 05, 2025, is being rescinded and replaced by Transmittal 13438, dated September 30, 2025, to add a new attachment to ensure the functionality of the NCD zip URL is working properly and to update the Policy section. All other information remains the same.
The purpose of this Change Request (CR) is to provide a maintenance update of ICD-10 coding changes specific to NCDs. ( TN 13438 ) (CR14197)
08/2025 - The purpose of this Change Request (CR) is to provide a maintenance update of ICD-10 coding changes specific to NCDs. ( TN 13375 ) (CR14197)
10/2024 - The purpose of the Change Request (CR) is to provide a quarterly maintenance update of ICD-10 coding conversions and other coding updates specific to National Coverage Determinations(NCDs). No policy is being changed as a result of these updates. ( TN 12903 ) (CR13818)
01/2024 - Transmittal 12350 issued November 03, 2023, is being rescinded and replaced by Transmittal 12440 dated January 3, 2024, to make changes to NCD 90.2, Next Generation Sequencing, spreadsheet to align with revisions being made to CR 13278. All other information remains the same. ( TN 12440 ) (CR13391)
11/2023 - The purpose of this Change Request (CR) is to provide a quarterly maintenance update of ICD-10 coding conversions and other coding updates specific to National Coverage Determinations (NCDs). No policy is being changed as a result of these updates.( TN 12350 ) (CR13391)
10/2023 - The purpose of this Change Request (CR) is to provide a quarterly maintenance update of ICD-10 coding conversions and other coding updates specific to National Coverage Determinations (NCDs). No policy is being changed as a result of these updates. ( TN 12319 ) (CR13391)
10/2022 - Transmittal 11546, dated August 4, 2022, is being rescinded and replaced by Transmittal 11636,
dated, October 5, 2022, to remove ICD-10 dx codes added in error to NCD 150.3, business requirement 12842.4, and restore ICD-10 dx C91.92 removed in error to NCD 110.23, business requirement 12842.3. All other information remains the same. ( TN 11636 ) (CR12842)
08/2022 - The purpose of this Change Request (CR) is to provide a maintenance update of ICD-10 conversions and other coding updates specific to NCDs. ( TN 11546 ) (CR12842)
10/2021 - This Change Request (CR) constitutes a maintenance update of ICD-10 conversions and other coding updates specific to NCDs. These NCD coding changes are the result of newly available codes, coding revisions to NCDs released separately, or coding feedback received. ( TN 11083 ) (CR12482)
01/2021 - Transmittal 10515, dated December 10, 2020, is being rescinded and replaced by Transmittal 10566, dated, January 14, 2021 to remove FISS Reason Codes (RCs) 59041, 59042, 59209, and 59210 from the spreadsheet for NCD 160.18. All other information remains the same. ( TN 10566 ) (CR12027)
12/2020 - This Change Request (CR) constitutes a maintenance update of ICD-10 conversions and other coding updates specific to NCDs. These NCD coding changes are the result of newly available codes, coding revisions to NCDs released separately, or coding feedback received.
Previous NCD coding changes appear in ICD-10 quarterly updates that can be found at: https://www.cms.gov/Medicare/Coverage/CoverageGenInfo/ICD10.html , along with other CRs implementing new policy NCDs. Edits to ICD-10 and other coding updates specific to NCDs will be included in subsequent quarterly releases and individual CRs as appropriate. No policy-related changes are included with the ICD-10 quarterly updates. Any policy-related changes to NCDs continue to be implemented via the current, longstanding NCD process. ( TN 10515 ) (CR12027)
10/2020 - This Change Request (CR) constitutes a maintenance update of ICD-10 conversions and other coding updates specific to NCDs. These NCD coding changes are the result of newly available codes, coding revisions to NCDs released separately, or coding feedback received.
Previous NCD coding changes appear in ICD-10 quarterly updates that can be found at: https://www.cms.gov/Medicare/Coverage/CoverageGenInfo/ICD10.html , along with other CRs implementing new policy NCDs. Edits to ICD-10 and other coding updates specific to NCDs will be included in subsequent quarterly releases and individual CRs as appropriate. No policy-related changes are included with the ICD-10 quarterly updates. Any policy-related changes to NCDs continue to be implemented via the current, longstanding NCD process. ( TN 10432 ) (CR12027)
02/2020 - This Change Request (CR) constitutes a maintenance update of ICD-10 conversions and other coding updates specific to NCDs. These NCD coding changes are the result of newly available codes, coding revisions to NCDs released separately, or coding feedback received.
Previous NCD coding changes appear in ICD-10 quarterly updates that can be found at: https://www.cms.gov/Medicare/Coverage/CoverageGenInfo/ICD10.html , along with other CRs implementing new policy NCDs. Edits to ICD-10 and other coding updates specific to NCDs will be included in subsequent quarterly releases and individual CRs as appropriate. No policy-related changes are included with the ICD-10 quarterly updates. Any policy-related changes to NCDs continue to be implemented via the current, longstanding NCD process. ( TN 2439 ) (CR11655)
How this NCD shows up on remittances
A service denied under a National Coverage Determination returns CARC 50 (not deemed medically necessary) with remark N386 (decision based on an NCD); a denial citing a local policy instead carries N115. Because NCDs bind nationally, the appeal path is documentation that the patient meets the indications above, not a contractor-policy argument.
How QuickIntell applies NCD 190.3
QuickAuth checks the ordered service and diagnosis against NCD and LCD criteria before the encounter, QuickCode validates the diagnosis pairing on the claim, and QuickRCM routes CARC 50 denials with the policy text and the covered-code list attached so the appeal starts with evidence.
Frequently asked questions — NCD 190.3
What does NCD 190.3 cover?
Medicare covers these tests when they are reasonable and necessary for the diagnosis or treatment of the following conditions: The full indications and limitations are reproduced on this page from the CMS Medicare Coverage Database.
When did NCD 190.3 take effect?
The current version (1) is effective 07/16/1998, published in transmittal 105. This is the only published version.
Does a Local Coverage Determination override NCD 190.3?
No. A National Coverage Determination binds all Medicare Administrative Contractors; an LCD can only address services or circumstances the NCD leaves open. Claims denied under this NCD typically return CARC 50 with remark N386 (NCD) rather than N115 (LCD).
Sources
Every figure on this page is taken from the CMS publications below, as released by the Centers for Medicare & Medicaid Services. Projection built 2026-10-02. Verify against the primary file before billing or contracting decisions.
- Medicare Coverage Database NCDs via the CMS Coverage APIVersion API snapshot 2026-09-27 · effective 2026-09-20 · file national-coverage-ncd.jsonSHA-256 a90fadfd264b9ef4…
Disclaimer
This page reproduces the CMS National Coverage Determination text and, for laboratory NCDs, the CMS ICD-10 edit lists, as an operational reference. Coverage decisions depend on the full policy, the claim and the contractor; nothing here is legal, clinical or billing advice. CPT codes are shown as numbers only; CPT descriptors are copyright AMA.