O24.313: Unspecified pre-existing diabetes mellitus in pregnancy, third trimester

O24.313, unspecified pre-existing diabetes mellitus in pregnancy, third trimester, is listed as a covered diagnosis in 3 Medicare billing and coding articles that apply to 35 HCPCS Level II codes, including M1211 (Most recent glycemic status assessment (hba1c or gmi)…), E2100 (Blood glucose monitor with integrated voice synthesizer), E2103 (Non-adjunctive, non-implanted continuous glucose monitor…). 20 of these codes have a 2026 DMEPOS fee schedule amount; E2100 pays $650.29 to $1,084.76 (NU) depending on the state. The articles come from 3 Medicare contractors. A listed diagnosis supports medical necessity only; coverage still depends on the LCD's criteria and on documentation in the medical record.

HCPCS Level II codes with O24.313 as a covered diagnosis

CodeDescriptionMedicare coverageDMEPOS fee 2026 (state range)Articles listing it
M1211Most recent glycemic status assessment (hba1c or gmi) level > 9.0%Carrier judgment—1
E2100Blood glucose monitor with integrated voice synthesizerSpecial coverage instructions apply$650.29–$1,084.76 (NU)1
E2103Non-adjunctive, non-implanted continuous glucose monitor or receiverCarrier judgment$256.09–$334.44 (NU)1
E2101Blood glucose monitor with integrated lancing/blood sampleSpecial coverage instructions apply$268.71–$322.42 (NU)1
A4239Supply allowance for non-adjunctive, non-implanted continuous glucose monitor (CGM), includes all supplies and accessories, 1 month supply = 1 unit of serviceCarrier judgment$273.281
A4238Supply allowance for adjunctive, non-implanted continuous glucose monitor (CGM), includes all supplies and accessories, 1 month supply = 1 unit of serviceCarrier judgment$280.71 (KF)1
E2102Adjunctive, non-implanted continuous glucose monitor or receiverCarrier judgment$189.08–$239.22 (NU)1
E0620Skin piercing device for collection of capillary blood, laser, eachCarrier judgment$124.59–$149.56 (RR)1
E0607Home blood glucose monitorSpecial coverage instructions apply$95.23–$108.55 (NU)1
E2104Home blood glucose monitor for use with integrated lancing/blood sample testing cartridgeSpecial coverage instructions apply$54.52 (NU)1
A4271Integrated lancing and blood sample testing cartridges for home blood glucose monitor, per 50 testsSpecial coverage instructions apply$34.101
A4257Replacement lens shield cartridge for use with laser skin piercing device, eachCarrier judgment$18.19–$21.831
A4253Blood glucose test or reagent strips for home blood glucose monitor, per 50 stripsSpecial coverage instructions apply$8.32 (NU)1
A4255Platforms for home blood glucose monitor, 50 per boxSpecial coverage instructions apply$5.58–$6.471
A4256Normal, low and high calibrator solution / chipsSpecial coverage instructions apply$3.381
A4234Replacement battery, alkaline, j cell, for use with medically necessary home blood glucose monitor owned by patient, eachCarrier judgment$2.36 (NU)1
A4258Spring-powered device for lancet, eachSpecial coverage instructions apply$2.121
A4259Lancets, per box of 100Special coverage instructions apply$1.421
A4236Replacement battery, silver oxide, for use with medically necessary home blood glucose monitor owned by patient, eachCarrier judgment$1.16 (NU)1
A4235Replacement battery, lithium, for use with medically necessary home blood glucose monitor owned by patient, eachCarrier judgment$1.00 (NU)1
A4233Replacement battery, alkaline (other than j cell), for use with medically necessary home blood glucose monitor owned by patient, eachCarrier judgment$0.51 (NU)1
E1399Durable medical equipment, miscellaneousCarrier judgment—1
A9999Miscellaneous dme supply or accessory, not otherwise specifiedCarrier judgment—1
A4244Alcohol or peroxide, per pintCarrier judgment—1
A4245Alcohol wipes, per boxCarrier judgment—1

10 more codes are listed. See every code with payment by region in Caduvo.

Medicare policy articles listing O24.313

A diagnosis listed as covered in a billing and coding article supports medical necessity for the article's codes; it does not guarantee payment. Coverage depends on the LCD's criteria, the contractor's jurisdiction and documentation in the medical record.

Other O24 diagnoses (Diabetes mellitus in pregnancy, childbirth, and the puerperium)

Frequently asked questions

Does Medicare cover O24.313 (Unspecified pre-existing diabetes mellitus in pregnancy…)?

Medicare covers items and services, not diagnoses. 3 Medicare billing and coding articles list O24.313 as a covered diagnosis for 35 HCPCS Level II codes: the diagnosis can support medical necessity for those codes, but payment still depends on the LCD's coverage criteria and the medical record.

Which HCPCS codes can be billed with ICD-10 O24.313?

The Level II codes from the policies most specific to this diagnosis are M1211 (Most recent glycemic status assessment (hba1c or gmi)…, 1 article); E2100 (Blood glucose monitor with integrated voice synthesizer, 1 article); E2103 (Non-adjunctive, non-implanted continuous glucose monitor…, 1 article); E2101 (Blood glucose monitor with integrated lancing/blood sample, 1 article); A4239 (Supply allowance for non-adjunctive, non-implanted…, 1 article). Code choice depends on the item supplied; check each code's descriptor.

What does Medicare pay for equipment billed with O24.313?

Under the 2026 DMEPOS fee schedule (non-rural state fees): E2100 $650.29 to $1,084.76 (NU); E2103 $256.09 to $334.44 (NU); E2101 $268.71 to $322.42 (NU); A4239 $273.28. Medicare pays 80% of the allowed amount after the Part B deductible.

Which Medicare policy articles list O24.313?

A56686 (Billing and Coding: HbA1c); A52464 (Glucose Monitor - Policy Article); A52996 (Billing and Coding: Routine Foot Care).

What is ICD-10-CM code O24.313?

O24.313 is the ICD-10-CM code for unspecified pre-existing diabetes mellitus in pregnancy, third trimester, in category O24 (Diabetes mellitus in pregnancy, childbirth, and the puerperium), chapter 15: Pregnancy, childbirth and the puerperium.

Next steps

Sources: CMS Medicare Coverage Database billing and coding articles (covered ICD-10 code lists and HCPCS links); ICD-10-CM FY2026; CMS HCPCS Level II release October 2026; CMS DMEPOS fee schedule 2026 (non-rural state fees). Not billing or legal advice.

Chapter 15: Pregnancy, childbirth and the puerperium · All diagnoses · HCPCS lookup