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CPC STUDY COURSE · 2026 EDITION

Diet-controlled gestational diabetes at 32 completed weeks

Read an original fictional chart, identify the supported facts, and explain your coding workflow.

Chart gym · Original fictional record

Service date: 2026-09-08 · Maternal prenatal outpatient record; payer and maternity billing arrangement require review

Use your code books and write your reasoning before opening the walkthrough. This exercise contains no real patient information.

Maternal history

Fictional patient Tess Rowan, age 29, attends a prenatal management visit at 32 weeks and 4 days of gestation. She had no diabetes before pregnancy. Her obstetric clinician previously diagnosed gestational diabetes during this pregnancy. Today’s signed assessment confirms that it remains controlled with diet alone.

Current review

The clinician reviews the patient’s glucose log and dietary plan and continues the existing diet-based management. The record does not document insulin, an oral hypoglycemic drug or an injectable non-insulin antidiabetic drug. There is no merely abnormal screening result awaiting diagnosis; gestational diabetes is already confirmed.

Encounter status

The patient is still pregnant. There is no labor, delivery or postpartum encounter on this date. No other pregnancy complication is assessed in this packet. The encounter focuses on management of gestational diabetes rather than routine supervision of an uncomplicated pregnancy.

Billing arrangement

The prenatal practice is tracking its 2026 maternity services. For this worksheet, do not assign a separate E/M level from the limited documentation or assume an independently billable visit. Review the complete maternity record, total visits, payer arrangement and current licensed guidance before deciding the procedure reporting. A 2027 publication does not automatically change a September 2026 service.

Coding desk

The trainee proposes type 2 diabetes, a long-term insulin-use code and 33 weeks because the pregnancy is closer to that week. Identify the maternal diagnosis sequence and completed-week information. Explain how the documented control method differs from insulin or oral-drug management, and why the current encounter is not childbirth or puerperium.

Your coding worksheet

  1. Identify the reason for this encounter and the supported diagnoses.
  2. List the services actually completed and the applicable code sets.
  3. Use your books to select final codes, units and any supported modifiers.
  4. Sequence the diagnoses and explain the relevant instruction.
  5. Review included work and any separate coverage question. Explain why the strongest alternative does not fit.

In your notebook, record the supported facts, your index route, the instructions you checked, and any missing detail that limits your answer.

Write your answer

Use only this fictional record. Your entries stay on this page and disappear when you leave or reload. Do not enter real patient information.

Compare with the worked explanation
  1. The clinician confirms diabetes arising in pregnancy, with no pre-existing diabetes. Use the gestational-diabetes branch rather than substituting type 2 diabetes or a still-unconfirmed abnormal screening result.
  2. O24.410 is the diet-controlled gestational-diabetes-in-pregnancy entry. The documented control method is diet only; do not move to a drug-controlled branch without that treatment.
  3. Add Z3A.32 for 32 completed weeks. Four extra days do not round the completed-week code up to 33. The Z3A code follows the obstetric condition, consistent with its Code first instruction.
  4. The Chapter 15 rule for gestational diabetes excludes additional Z79.4, Z79.84 and Z79.85 reporting with O24.4. In this record there is also no such medication use to begin with.
  5. This is the maternal antepartum record. Do not use childbirth or puerperium branches and do not treat a complication-management visit as normal-pregnancy supervision.
  6. The procedure decision requires the broader maternity billing arrangement and licensed 2026 instructions. The original case supplies enough facts for diagnosis reasoning, but does not manufacture an E/M level or a complete global obstetric service. Future 2027 changes are not applied early.

Reference sections: O24.410; Z3A.32; ICD I.C.15.a/i; 2026 maternity transition

Practice the linked chart questions

Review the lesson

Sources

  1. CDC NCHS — ICD-10-CM April1,2026 Index and Tabular XML. April1–September30,2026. Accessed 2026-09-12.
  2. CDC/NCHS and CMS — ICD-10-CM April 1 2026 Guidelines. FY2026 April. Accessed 2026-09-10.
  3. American Medical Association — FAQs: CPT 2027 Maternity Care Services code changes — 2026 transition. 2026 care under 2026 rules; revised framework effective January1/2027. Accessed 2026-09-10.

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